A kind of dicryo peptide polyolefin catalyzer has the structure expression of the figure (1). The R1 and R2 are the substituents on the benzene ring respectively and are selected from the Hydrogen or alkyls of C1-C8 and the number of the substituents on the benzene ring is between 1 and 4. The R3 is selected from the Hydrogen or alkyls of C1-C3. The R4 is the substituents on the pyridine ring and is selected from the Hydrogen or alkyls of C1-C6 and the number of the substituents is between 1 and 3. Y is selected from the -O-, -S- or -CH2-, M from the IV metals. It doesn't matter whether the X is same radical or not and the X is selected from the halogen or the condensation substance of the pyrrolic compound with pyrrole aldehyde anil, pyrrole aldehyde cyclohexylamine or its alkylation material and the alkyl is selected from the alkyl of C1-C4. The compound cooperates with the alkylaluminium oxyalkyl or alkylaluminium to be the catalyzer of olefinic polymerization to get the polyolefin products with high molecule weight.