Paint spraying device for robot shell

The utility model discloses a paint spraying device for a robot shell. The paint spraying gun comprises a paint spraying gun body, a diluent tank body and a chute, a first sliding block is mounted atthe side part of the paint spraying gun body; a guide block is movably connected to the interior of the first sliding block; second sliding blocks are mounted on the two sides of the guide block; twogroups of sliding grooves are symmetrically formed relative to the guide block; the two sets of second sliding blocks are movably connected into the two sets of sliding grooves correspondingly. Threaded holes are formed in the side portions of the two sets of sliding grooves correspondingly, stop rods are in threaded connection with the interiors of the threaded holes correspondingly, scale marksare evenly distributed on the side portions of the stop rods, a paint spraying pipe is installed on the side portion of the paint spraying gun body, a nozzle is installed on the side portion of the paint spraying pipe, and the