The invention discloses an automatic grinding and paint spraying device for a sound enclosure, and relates to the technical field of sound equipment. The automatic grinding and paint spraying device comprises an outer frame, the bottom of the inner wall of the outer frame is connected with a supporting plate through a damping device, and the top of the supporting plate is fixedly connected with atransmission working platform through a fixed supporting column; the transmission working platform is internally provided with a transmission limiting column belt, one side of the top of the supporting plate is rotatably connected with a power gear through a gear mounting frame, and the two ends of the transmission limiting column belt are provided with protective arms; and moving devices are arranged on the two sides of the lower portion of the outer wall of the outer frame, and the inner sides of the moving devices are fixedly connected with the supporting plate. According to the automatic grinding and paint spraying device for the sound enclosure, the supporting plate conducts up-down movement and buffering damping and conducts grinding and paint spraying on a workpiece, uniformity of grinding and the quality of paint spraying after grinding are ensured, the process of automation is speeded up, the working efficiency is improved, the labor cost is reduced, and productive force is liberated.