Laser cladding in-situ synthesis technology prepared an iron-based laser cladding layer reinforced with composite ceramic particles on the surface of Q235 steel. The microstructure and properties of the laser cladding layer were systematically studied using testing and analysis methods such as microhardness tester, optical microscope, scanning electron microscope (SEM), X-ray diffractometer (XRD) and sliding wear testing machine. This paper uses the synchronous powder feeding method to conduct experiments to study the effects of laser scanning speed, laser power, multi-pass overlap rate, protective gas flow, carrier gas flow and powder feeding rate on the formation and performance of the cladding layer. Studies have shown that when the laser power is 2000W, the scanning speed is 250mm/min, the protective air flow is 6-7L/min, the powder feeding rate is 10g/min, and the overlap rate is 30, a product with good surface formation and wear resistance can be obtained. Large area cladding layer. The effects of different components and addition amounts of alloy powder on the structure and properties of the cladding layer were studied. Tests have shown that ferrotitanium, ferromolybdenum, and boron carbide can generate a large number of carbide particles in the cladding layer through in-situ reactions, thus playing a role in particle reinforcement. However, when these components are added in excess of a certain amount, too many ceramic particles are generated, which increases the viscosity of the melt, resulting in poor formation of the cladding layer, and even inclusions, cracks, and easy peeling of the coating. The addition of ferrotitanium and ferromolybdenum can react with boron carbide to generate ceramic particles such as TiB2, TiC and MoC, which effectively enhances the wear resistance of the coating. High-nickel iron-based alloy powder contains a large amount of Ni, Cr, and a small amount of Mo and C, which causes some Cr7C3 and other carbides to be generated in the coating. Some Mo and Cr elements are solidly dissolved in the matrix, which plays a role in the cladding layer. The role of solid solution strengthening. Using titanium iron (containing titanium 30), ferromolybdenum (containing molybdenum 60), B4C, and high-nickel iron-based alloy mixed powders, a layer of wear-resistant coating was clad on the Q235 substrate to prepare TiB2, TiC, MoC and B4C The Fe-based cladding layer reinforced by composite particles has a good surface shape and no internal defects such as slag inclusions and cracks. The structure is dense and the hard phase is evenly distributed. The wear mechanisms of the composite phase cladding layer are mainly microcutting and adhesive wear. Since the cladding layer has a high average microhardness (around 1100HV0.3), it is difficult for the cladding layer to undergo plastic deformation during the wear process, so it has excellent wear resistance. Under the same test conditions, the wear loss of the composite coating is approximately 1/25 of Q235. That is, the wear resistance of the cladding layer is about 25 times that of Q235.