Pipeline outer surface derusting machine

The utility model relates to the field of pipeline derusting, in particular to a pipeline outer surface derusting machine which comprises a box body, through holes are formed in the two side walls of the box body, a derusting mechanism is installed on one side of an inner cavity of the box body and comprises a derusting ring, a bearing is fixedly installed on one side of the outer wall of the derusting ring in a sleeved mode, and the outer wall of the bearing is connected with the inner wall of the box body through a connecting rod. The other side of the outer wall of the rust removal ring is fixedly sleeved with a second gear, the outer wall of the second gear is meshed with a first gear, and the first gear is fixed to the outer end of a transmission shaft of a motor. When a steel pipe penetrates through the rust removal ring, the rust removal ring is driven by the motor to alternately rotate in a reciprocating mode, so that rust on the surface of a pipeline is taken out through the laser rust remover, dust