The amine bis(phenolate) tetradentate ligand fourth sub-group metal complex and application thereof, and belongs to the technical field of olefin polymerization catalysts. The structural formula of the amine bis(phenolate) tetradentate ligand fourth sub-group metal complex is shown in the description. The amine bis(phenolate) tetradentate ligand fourth sub-group metal complex as a main catalyst, and alkylaluminoxane, halogenated alkyl aluminium, or a mixture of aluminum alkyl and a boron agent as a promoter can be used for catalyzing ethylene homopolymerization, alpha-olefin homopolymerization or copolymerization of ethylene and alpha-olefins. The complex provided by the invention as a catalyst has the advantages of being good in heat resistance and high in polymerization activity during the polymerization process.