The invention discloses a pipeline spraying robot, and belongs to the spraying robot field. The robot comprises a peripherally-connected connecting mechanism, a walking support mechanism for the autonomous walking of the robot in a pipeline, a spraying mechanism for spraying, a curing mechanism for rapid curing work and a video acquiring mechanism for acquiring recording video information, and the connecting mechanism is sequentially connected with the walking support mechanism, the spraying mechanism, the curing mechanism and the video acquiring mechanism. The spraying robot drives ultraviolet light curable lamps to slowly rotate through a motor and a decelerator to simultaneously realize spraying and rapid curing; and a walking mechanism is matched with a deceleration motor, so the walking speed of the spraying robot can be controlled through a variable-frequency speed regulator, thereby the spraying thickness is controlled according to the different spraying demands of the pipeline. The spraying robot is simple, is easy to operate and is suitable for the spraying of the inner walls of large pipelines.