Improving the performance of the mold coatingsMold coating is of great significance to extend the service life of the mold. This study examines the microstructureMicrostructure and hardnessHardness of coatings after different cryogenic holding timesCryogenic holding time. The results show that the grain structure of the Ni-Co-Cr ternary alloy coatings remains unchanged after deep cryogenic treatmentDeep cryogenic treatment, no new phase is formed, and the grain size is significantly refined. In addition, the deep cryogenic treatmentDeep cryogenic treatment makes the particles on the surface of the coatings more compact and evenly distributed, so that its hardnessHardness is significantly increased. The study found that the hardnessHardness of the coatings increased by 12.8% after deep cryogenic treatmentDeep cryogenic treatment for 24 h, respectively, compared with that before deep cryogenic treatmentDeep cryogenic treatment. At the same time, the effect of cryogenic treatmentCryogenic Treatment on the wear resistanceWear Resistance of the coatings was explored. This study provides a new method for further improving the performance of mold coatingsMold coating.