The invention discloses a poly(triphenylamine-benzothiophene/furan) dye and application thereof. The poly(triphenylamine-benzothiophene/furan) dye is provided with a triphenylamine structure unit and a benzothiophene/furan structure monomer, wherein the triphenylamine structure unit contains a conjugated system and a carboxyl group, and the benzothiophene/furan structure monomer is provided with a long alkyl side chain. According to the poly(triphenylamine-benzothiophene/furan) dye, the symmetry and solubility are good; due to a rigid-plane [pi] conjugate skeleton, electron delocalization and intermolecular interaction can be promoted, and charge migration rate can be effectively increased; and by using the poly(triphenylamine-benzothiophene/furan) dye as a dye layer material, dye-sensitized solar cells with high current density and high photoelectric conversion ratio can be prepared.