The invention relates to the technical field of organic dyes, and discloses a carbazole-based bridged D-(Pi-A)2 type organic dye, and a preparation method and an application thereof. The organic dye has a chemical structural formula which is described in the specification. The carbazole-based bridged D-(Pi-A)2 type organic dye provided by the invention has good light-trapping performance, has stronger abilities of inhibiting aggregation of dye molecules and retarding interface electron recombination of a battery, and has high photothermal stability at the same time; in addition, the organic dye has simple preparation method, high yield and low preparation cost, and is a photoelectric material with excellent performances; and the organic dye used as a single sensitizing agent is applied todye-sensitized solar cells, and photoelectric conversion efficiency of 8.68% or more can be obtained.