The invention belongs to the technical field of solar batteries, which more particularly relates to a preparation of a novel triphenylamine group organic dye and the application thereof as a photosensitizer in a dye-sensitized solar cell. The triphenylamine group organic dye provided by the invention has excellent light-capturing capacity; the D-Pi-A molecular structure thereof causes the effective transferring of the electrons in the molecule. The titanium dioxide electrode sensitized by the dye is applied to the dye-sensitized solar cell and obtains a higher photoelectric conversion property. The novel triphenylamine group organic dye provided by the invention is novel in structure, is easy to be composed, is low in cost, and has excellent photoelectric properties, can be modified by molecule designing and shows a potential application prospect to replace a heavy metal organic photosensitizer.