The present invention relates to a pyrazole pyrolysis furnace which is capable of regulating the composition of a feed gas to a prismatic torch of a pyrolysis furnace, circulating a reaction gas to a reaction furnace, or using an alkali substance in a reaction furnace, And to design and manufacture economical reaction furnace that minimizes.;In order to realize this, the desired purpose can be achieved by adding an oxygen supply facility to the plasma gas supply device, adding a circulation line of pyrolysis gas and adding an alkali injection device in the reaction furnace. By doing so, the thermal effect of the plasma device is improved by 1.5 to 2 times, the supply of CO in pyrolysis gas is increased, the emission contaminant is fundamentally lowered, and the slag melting point is reduced,
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