The invention discloses a trifluoromethyl-containing conjugated polymer, and a preparation method and applications thereof. The trifluoromethyl-containing conjugated polymer is represented by formulaI. The synthesis route is simple and convenient; synthesis steps are few; yield is high; the preparation method is suitable for large scale preparation. Field effect transistors prepared taking the trifluoromethyl-containing conjugated polymer as organic semiconductor layers are relatively high in mobility and on/off ratio; the mobility is 0.11cm<2>V<-1>s<-1>, and the on-off ratio is larger than 105. It is shown by research results that the trifluoromethyl-containing conjugated polymer is an excellent electron transport material, and is promising in application prospect in the field of organicfield effect.