The invention provides a dye-sensitized solar cell, organic dye with a dihydrothiophene benzene-carbazole and diazosulfide structure and a preparation method of the organic dye. The organic dye has a structure shown in a formula I. Dihydrothiophene benzene-carbazole and diazosulfide respectively serve as electronic donor-acceptor units of the organic dye with the structure shown in the formula I; a donor and an acceptor are directly connected with each other through a carbon-carbon bond or are connected with each other through three bonds to form a chromophoric group of the organic dye, and replaced carboxylic acid arranged at the tail end of the organic dye serves as a graft unit to form a series of donor and acceptor organic dye molecules. The organic dye serves as a sensitizer preparation dye layer of the dye-sensitized solar cell, and the manufactured dye-sensitized solar cell has high power conversion efficiency. An experiment result shows that the power conversion efficiency of the dye-sensitized solar cell manufactured by the organic dye can reach 12%.