The effects of laser scanning speed on microstructure, hardness and friction and wear properties of TiB2/S136 composites in laser selective melting process controlled by PLC were studied by means of X-ray diffraction, scanning electron microscopy, hardness tester and friction and wear tester. The results show that the main phases of the formed parts are α-Fe, γ-Fe and TiB2 under four different laser scanning speeds; with the decrease of laser scanning speed, the compactness of the formed parts first increases and then decreases, and when the laser scanning speed is 700 mm/s, the maximum value (98.4%) is obtained, and there are no obvious holes or microcracks in the formed parts. With the decrease of laser scanning speed, the hardness, average friction coefficient and wear rate of XY and YZ surfaces of the formed parts decrease first and then increase. When the laser scanning speed is 700 mm/s, the maximum hardness, the minimum average friction coefficient and wear rate are obtained, which is mainly due to the high compactness, fine and uniform grains and high hardness are related to the shape.