The diaminodikhunophenoxy chloride indium phthalocyanine (Pc) was covalently bonded with carboxylated GO (GO-COOH) to obtain the diaminodikhunophenoxy chloride indium phthalocyanine-graphene oxide (Pc-GO-COOH), and the bonding products as raw material of the reaction initiator. Four kinds of polymer samples with different molecular weight were obtained by atom transfer radical polymerization (ATRP) with methyl methacrylate (MMA) as polymerization monomer. The molecular weight and molecular weight distribution of the prepared polymers were tested by gel permeation chromatography (GPC). The test results show that the preparation of polymers has narrow molecular weight distribution, the polymer reaction presents good controllability. The results of third-order nonlinear optical properties test on polymer sample solution by Z-scan show that the preparation of polymer has excellent third-order nonlinear optical properties, and when the molecular weight of polymer, respectively 9 063 and 12 196, the third order nonlinear polarizability values are 8.1×10-11 esu and 2.1×10-11 esu. At the same time, the optical limiting performance test show the effective excitation and ground state absorption cross section ratios of the two samples are 2.69 and 2.20, respectively. It has a good limiting ability and a great application prospect.