The invention discloses a broken tooth and spindle wear repair process for a single-tooth roller of a crusher. The process comprises the following steps: S1, cutting two sides of the broken tooth or aspindle wear part by oxygen, wherein the cutting depth is 20 mm higher than a wear surface, and cutting a damaged surface into a groove, the section of which is U-shaped, wherein the bottom surface of the groove is arc-shaped; S2, polishing the groove by a grinding machine till a bright and clean surface of a metal is exposed to the inner wall and the bottom surface; S3, carrying out online cladding on the groove by using a laser cladding welding machine; and S4, grinding and polishing a cladding layer. By carrying out online repair on the wear part by adopting the laser cladding welding machine, an original manual welding operating mode is improved, the labor intensity of a welding worker is reduced, and the welding efficiency and the utilization ratio of materials are improved and increased. In addition, the laser cladding welding machine can be adjusted and prepared intelligently, and generation of interlaminar oxides during welding can be avoided by means of a stable welding pointspot power principle of the laser cladding welding machine, so that the cladding welding precision is improved favorably.