A carriage for a processing pipe is disclosed. The carriage for a processing pipe according to an embodiment of the present invention comprises a robot body for moving in the circumferential direction of a pipe; a guide unit covering the pipe for supporting the robot body in the pipe; a tension adjustment part for adjusting the covered area of the pipe by the guide unit to supply a fastening force for covering the pipe; and a processing unit joined to the robot body for processing the pipe. The robot body includes a support sprocket engaged with the guide unit to be able to rotate. The guide unit is shaped into a closed loop for covering the pipe and the support sprocket.
