Abstract: In order to reduce the maintenance cost and drilling cycle of PDC bit, a robot was proposed to realize the bit remanufacturing based on laser cladding remanufacturing technology. Based on reverse engineering, data acquisition was carried out on PDC bit, and then data processing and 3D reconstruction were carried out on the obtained bit point cloud data to construct the same 3D model as the solid PDC bit. The software Geomagic Boolean operation was used to obtain the defect part of the workpiece. In software NX1899, isometric plane family Γ was used to intersect the repair part of the drill bit to realize the path planning of the curved part.The trajectory of PDC bit repaired by robot end welding gun was simulated. The software PQart was used to simulate the position of the workpiece relative to the robot in the working environment to realize the trajectory optimization of the robot. The position of robot end welding gun was adjusted to improve the surface performance of PDC bit after repair. The feasibility of the proposed method is verified, which provides a reference for laser cladding remanufacturing technology to repair complex surfaces.