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The polycrystalline diamond (PCD) tool will produce severe wear when cutting the bearing ring which is a ferrous metal material. In order to reduce the wear of the PCD tool and achieve higher quality bearing ring machining, the cutting parameters of turning bearing ring with low-temperature liquid carbon dioxide (CO2) assisted PCD tool was studied. In this paper, experiments were carried out based on the completed cryogenic cooling system. The experimental results show that the reference cutting temperature increases with the increase of feed rate and cutting speed. The optimal parameters extend the tool life by 2.5 times and make the cutting temperature more stable. The change in cutting speed has a more noticeable impact on the reference cutting temperature than the feed rate. The surface roughness of the workpiece increases with the increase in feed rate and cutting speed. The optimal parameters of feed rate and cutting speed reduce the surface roughness of the workpiece by 81.5 % and 45.8 %, respectively. The primary wear forms of the PCD tool are graphitization, diffusion wear, adhesion wear and tool edge breaking. The tool wear increases with the increase of feed rate and cutting speed. The optimal parameters of feed rate and cutting speed reduce flank wear of the PCD tool by 42.7 % and 47.8 %, respectively. Moreover, the technological parameters of feed rate and cutting speed are presented for reference in actual machining.