The present invention relates to a method for manufacturing a multi-junction solar cell and to a multi-junction solar cell manufactured thereby, in the method for manufacturing a multi-junction solar cell, comprising: a first step of forming a light absorption layer on an epitaxial growth substrate; A second step of forming a back electrode on the light absorption layer, a third step of removing the substrate for epitaxial growth from the light absorption layer, and a first step of forming a front electrode on the light absorption layer on the side from which the substrate for epitaxial growth is removed Step 4, wherein the light absorption layer is composed of N sub-cells (N is a natural number greater than or equal to 2) having different absorption wavelengths, and each sub-cell is tunnel junction to form multiple junctions. A method for manufacturing a multi-junction solar cell and a multi-junction solar cell manufactured thereby are technical gist. Thereby, a multi-junction solar cell with improved solar cell efficiency by improving transmittance and electrical conductivity by applying a tunnel junction structure as a recombination layer instead of a transparent electrode and a metal electrode is provided.
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