WC-25Co cemented carbides were prepared by laser directed energy deposition technology using spherical WC-12Co composite powder and spherical Co powder as raw materials. The effects of laser power on the microstructure and friction and wear properties of WC-25Co cemented carbides were studied. The results show that the Co particles melt and form liquid phase, which significantly improves the deposition quality of WC-12Co. The increase in laser energy promotes the flow of Co liquid phase, and the densification degree and microstructure uniformity of the alloy are significantly increased. The alloy structure is composed of WC phase and Co phase, and no decarburization phases such as Co₃W₃C, Co₆W₆C and W₂C are found. With the increase in laser power, the alloy hardness increases gradually, and the wear rate decreases first and then increases. At the laser power of 1400 W, the wear rate in WC-25Co cemented carbide is the lowest, which is (0.81±0.11)×10^-5 mm³/(N·m). The wear mechanism is mainly abrasive wear, and there is also a small amount of oxidation wear.