Abstract: CoCrFeNiW_x(x=0.2, 0.5, mole fraction/%) high entropy alloy powder was prepared by mechanical alloying method. The powder was mixed with WC powder as a binder (adding mass fraction was 6%, 10%, 14%, respectively), and then WC cemented carbides were obtained by spark plasma sintering. The effect of the high entropy alloy binder on the microstructure and mechanical properties of the cemented carbide was studied. The results show that the CoCrFeNiW_x high entropy alloy binder had a face-centered cubic and body-centered cubic dual-phase structure and could refine grains in WC cemented carbides. With the increase of high entropy alloy binder content, the Vickers hardness of the WC cemented carbide decreased, and the fracture toughness and bending strength had a general increase trend. The WC cemented carbide prepared by adding 10wt% CoCrFeNiW_0.2 high entropy alloy binder had the best comprehensive performance, with Vickers hardness of 1 785 HV, fracture toughness of 10.6 MPa·m^1/2, and bending strength of 1 373 MPa.