The present invention relates to a conjugated polymer compound for a polymer solar cell donor and a polymer solar cell comprising same, wherein the conjugated polymer compound has a D-A form in which an electron-donating unit (benzodithiophene, BDT) and an electron-withdrawing unit (quinoxline, Qx) are combined, where a cyano (CN) substituent instead of fluorine (F) is introduced into the Qx unit to improve charge generation, charge transfer, and charge recombination characteristics of the polymer solar cell regardless of the type of acceptor contained in a photo-active layer, so that a polymer solar cell with greatly improved photo-conversion efficiency (PCE) can be implemented.