The invention provides a preparation method of a nickel-chromium chromium carbide wear-resistant coating. The preparation method includes the following steps that 1, powder of NiCr and Cr3C2 is mixedto be uniform in proportion, and after the mixture is sintered, nickel-chromium chromium carbide powder is obtained; and 2, a nickel-chromium chromium carbide (NiCr-Cr3C2) remelted coating is prepared, wherein 1), the surface of a matrix is subjected to sand blasting pretreatment; 2), the matrix obtained after sand blasting treatment is subjected to plasma spraying; 3), a coating sample obtained after plasma spraying is subjected to preheating treatment before remelting, then a tungsten electrode argon arc welding machine is adopted for TIG remelting treatment, then heat insulation treatment after remelting is carried out, and finally the nickel-chromium chromium carbide wear-resistant remelted coating is obtained; argon is adopted as shielding gas in the TIG remelting process, wherein theTIG remelting current is 85-100 A, the argon arc length is 2 mm, the argon flow is 10 L/min, the remelting speed is 200 mm/min, and the step length is 1.5 mm. The preheating temperature and the heatinsulation temperature are both 300 DEG C, and the time is 2 hours. By means of the method, mechanical bonding between the coating and the matrix is converted into metallurgical bonding, and the mechanical performance and the wear-resistant performance of the coating are improved.