A nano-tungsten carbide silver contact material and a preparation method thereof, wherein the tungsten carbide silver contact material is mainly composed of tungsten carbide powder, nickel powder, silver powder and stearic acid powder and is ball-milled to obtain a nano-WC/Ag composite powder, After reduction, pressing, sintering, re-pressing, and re-firing, nano-tungsten carbide silver electrical contacts are obtained. The weight ratio of tungsten carbide to silver is 40-80:20-60, and the particle size of the tungsten carbide phase is 50-500nm; The addition of the nickel powder is 0-2% of the mass percentage of the tungsten carbide powder; the addition of the stearic acid powder is 0.5-5% of the mass percentage of the tungsten carbide-silver-nickel mixed powder; the preparation method is: Weigh tungsten carbide powder and nickel powder, cemented carbide balls and alcohol according to the proportion and place them in a planetary high-energy ball mill for 12-72 hours. Take out the mixed powder and dry it, mix it with silver powder and stearic acid powder in a specific proportion and place it on a planetary ball mill. Milled in a high-energy ball mill for another 6-24 hours, the nano-WC/Ag composite powder obtained after ball milling is processed by reduction, pressing, sintering, re-pressing, and re-sintering to obtain uniform structure, high density, high hardness, and good electrical conductivity. , Nano-tungsten carbide silver electrical contacts with good anti-welding properties.