The study on the effect of laser power on the mechanical properties of laser cladded 27SiMn steels can be concluded that 1800 W is the optimum power for laser cladding. A laser cladded coating with good mechanical properties is obtained with a laser power of 1800 W, a scanning speed of 20 mm/s, a powder feeding rate of 18 g/min, a defocusing distance of 0 mm, and a spot diameter of 2 mm. The microstructure in the middle of the laser cladded layer of the specimen at 1800 W shows more cytosine crystals and a small number of dendrites and columnar crystals. The more cellular crystals can make the specimen less prone to fracture. The heat-affected zone of the laser cladded coating is the smallest, therefore the damage to the substrate is the lowest and the fracture of the tensile specimen is mainly ductile. Above all, the research results here can provide a good reference for the hydraulic support remanufacturing engineering practice.