The invention discloses a preparation process of a wear-resistant stainless steel alloy coating. The preparation process comprises the following steps of S1, selection of raw materials, S2, embedmentof polytetrafluoroethylene in alloy powder, S3, preparation and stacking of metal cloth, S4, brazing, and S5, coating of the alloy coating on the stainless steel surface. Tungsten carbide hard alloy powder and NiCrBSi self-fluxing brazing alloy powder are used as a hard phase and subjected to rolling with polytetrafluoroethylene into the cloth, then the cloth adheres to the surface of stainless steel and then brazed into a metallurgical bonding composite coating, and the flexible metal cloth can adhere to the surface of a complex structural part; when brazing, the metal cloth and a substrate are simultaneously heated, the thermal residual stress of the coating is small, the thickness variation range of the coating is wide, and the surface roughness is small, so that the stainless steel surface has high wear resistance and erosion resistance; and the anti-abrasive wear performance of the obtained coating is much higher than the anti-abrasive wear performance of a flame surfacing coating, and the wear resistance and tensile strength of a stainless steel substrate are significantly improved.