The invention relates to a vanadium complex containing triphenylmethyl substituent salicylaldehyde aldimine and use thereof, and belongs to the technical field of catalysts. The structural expression formula of the vanadium complex containing triphenylmethyl substituent salicylaldehyde aldimine is as shown in the description. By taking the vanadium complex containing triphenylmethyl substituent salicylaldehyde aldimine as a primary catalyst, alkylaluminoxane or alkyl aluminium chloride as an auxiliary catalyst, and chloro ethyl acetate as an activating agent, the complex is used for catalyzing ethylene homopolymerization or copolymerization of ethylene and alpha-olefin, styrene, norbornene and cyclohexane. The complex provided by the invention has the advantages of being high in catalytic activity, good in thermal stability, long in service life, good in copolymerization property, less in dosage of the catalyst and the auxiliary catalyst and the like.