Spraying equipment for inner wall of steel pipe

The utility model relates to the technical field of coating spraying, in particular to spraying equipment for the inner wall of a steel pipe, which comprises a bottom plate, a movable lifting device arranged on one side above the bottom plate, a coating box arranged above the movable lifting device, a water pump arranged in the coating box, and a spray head connected with the water pump through awater pipe and arranged outside the coating box. Two first sliding rails are symmetrically arranged on one side of the coating box, two rotating roller devices are connected between the two first sliding rails in a sliding mode, supporting rods are arranged at the four corners of the peripheries of the two rotating roller devices, a top plate is arranged at the tops of the four supporting rods, and a set of first hydraulic cylinders are arranged above the top plate. Piston rods of all the first hydraulic cylinders penetrate through the top plate downwards, a driving device is connected to thelower portions of the pist