a density of 0.75 to 0.85 g/cm 3 and a thickness of 2.5 to 7.0 mm by pressurizing the mixture prepared by administering and stirring an adhesive mixed with methylen diphenyl diisocyanate (30) ), the adhesive 20 is applied between the fiberboard manufacturing step (S20) and the plurality of veneers 41, and the plywood ( 40) in the plywood manufacturing step (S30) and the finishing material 10 and the high-density fiberboard 30 and plywood 40 having water resistance are adhered and cold-pressed with an adhesive 20 to produce the flooring material 50 Including the step (S40) and the processing step (S50) of cutting and removing the flooring material 50 according to the standard, In the cold-pressing step (S40), the adhesive 20 is applied to one side of the high-density fiberboard 30 having water resistance in an application amount of 140±10 g/m 2 , and the plywood 40 is seated in the direction so that the high-density fiberboard 30 is on the upper surface. and apply the adhesive 20 to the other side of the high-density fiberboard 30 with water resistance at an application amount of 120±10 g/m 2 , and after placing the finishing material, press with a cold press at a pressure of 10±1 kgf/cm 2 for 40 A method for producing a flooring material combined with plywood and high-density fiberboard, which includes manufacturing a smooth flooring material by applying pressure for ±10 minutes, curing for 24 ±4 hours, loading it on a double-sided sealed pallet, and seasoning for 72 hours; A method of manufacturing a flooring material in which plywood and high-density fiberboard are combined, including a painting step (S60) of applying UV paint to the surface of the plywood 40 of the processed flooring material 50; The finishing material 10 is a method of manufacturing a flooring material in which plywood and high-density fiberboard are combined, including either a thermosetting high pressure melamine (HPM) or natural veneer; The thermosetting high pressure resin decorative plate (HPM, high pressure melamine) is a flooring manufacturing method in which plywood and high-density fiberboard are combined, including a base layer 11, a patterned paper 12, and a protective paper 13; The base layer 11 is formed of a paper or fibrous base impregnated with a thermosetting resin, and the surface paper and the printing paper, which are melamine overlay paper, and the printed paper, which are patterned paper, are respectively impregnated with melamine resin and then dried. , the impregnation step of each kraft paper, which is a core paper and a stress paper, in a phenolic resin and then drying the adhesive paper, the core paper, and the stress paper, and each of the impregnated and dried surface paper, printing paper, adhesive paper, core paper, stress A molding step of sequentially stacking paper and molding at a pressure of 100 kgf/cm 2 at 150° C., and a mirror surface on the surface paper in a state in which the surface paper, printing paper, adhesive paper, core paper, and stress paper are integrally molded as described above. After seating the plate, the substrate layer is subjected to a pressing step of pressurizing at a pressure of 80 to 120 kgf/cm 2 at 120 to 160° C., and a molding completion step of maintaining the pressurized state at 150 to 180° C. for 30 to 50 minutes to complete the molding. A method for manufacturing a flooring material in which plywood and high-density fiberboard are combined, including completing (11); Crushing by-products containing any one of logs, bushes, sawn bark, or processed chips to a certain size, and adding 80 to 99% by weight of melamine-urea-formaldehyde resin and 1 to 20% by weight of EMDI (Emulsifiable methylen diphenyl diisocyanate) A method for manufacturing a flooring material in which plywood and high-density fiberboard are combined, comprising manufacturing a high-density fiberboard 30 having water resistance; The adhesive 20 is a flooring manufacturing method in which plywood and high-density fiberboard are combined, including using an adhesive containing an aqueous EVA (ethylene-vinyl acetate) resin; The UV paint is, 44 to 54 wt% of trimethylolpropane EO modified triacrylate, 17 to 27 wt% of 2-propenoic acid 1,6-hexanediyl, 2-hydroxy-2-methyl-1-phenyl- A method for manufacturing a flooring material in which plywood and high-density fiberboard are combined, comprising 4 to 14 wt% of 1-propanone, 1 to 10 wt% of benzophenone, and 0.1 to 4 wt% of an aromatic hard naphtha solvent; As a structural feature of "a flooring in which plywood and high-density fiberboard are combined, characterized in that manufactured by the above manufacturing method," The present invention configured as described above is vulnerable to moisture, which is a disadvantage of existing reinforced flooring, by adhesively bonding high-density fiberboard with water resistance to plywood and finishing it with a thermosetting high-pressure resin veneer or natural veneer, which is a finishing material. It minimizes product deformation due to material adhesion, and fundamentally improves product quality stability by collectively improving factors such as dents, scratches, abrasion, surface cracks, shrinkage and expansion due to moisture, and dimensional changes, which are the disadvantages of existing steel flooring. has the effect of having In addition, by overcoming the vulnerability of alkali resistance, it does not discolor when used for a long time due to sweat or human oil, and it solves the roughness of the wood surface and exhibits a strong abrasion resistance effect."/>