The invention discloses a triphenylene-flexible bridge-perylene diimide binary compound and a preparation method thereof and application of the compound serving as an organic solar cell active layer. Compared with the prior art, the triphenylene-flexible bridge-perylene diimide binary compound has the advantage of easily adjusting the liquid crystalline phase transformation temperature and temperature interval, and the compound has the application in photology, electrooptics and electronics, and particularly has the application in serving as the organic solar cell active layer. Please see the formula in the description.