Abstract: This study systematically investigated the effects of laser heat treatment parameters, including laser power, scanning speed, and processing temperature, on the hardness and wear resistance of YG8 cemented carbide tools. The laser power was set at 640, 840, and 1 040 W, scanning speeds of 1.0, 1.5, 2.0, and 2.5 mm/s, and processing temperatures of 600, 800, and 1 000 ℃. A hardness tester and a wear testing machine were employed to identify the optimal process combination and elucidate the underlying mechanism. The results indicated that the highest surface hardness under a Q4.9 N load was (150HV±4HV) with the lowest steady-state coefficient of friction of (0.292±0.015) at a laser power of 840 W, (160HV±4HV) with coefficient of friction of (0.350±0.015) at a scanning speed of 2.0 mm/s, and (152HV±4HV) with coefficient of friction of (0.30±0.015) at a processing temperature of 800 ℃, respectively. The optimal combination of laser power at 840 W, scanning speed of 2.0 mm/s, and processing temperature of 800 ℃ yielded the best overall hardness and wear resistance for the YG8 tools. The findings demonstrate that rational control of laser heat treatment parameters can significantly improve the surface performance of YG8 cemented carbide tools, making them particularly suitable for high-precision machining applications.