The wall plaster, also known as plastering machine and plastering machine, is a special machine for wall plastering. It has a vertical Longmen rack and a windlass windlass mounted on the top of the chassis. It has a hopper connected to the chassis on the inside of the two column of the scraper rack. The hopper can slide up and down on the two vertical columns through the hoist. One side of the Longmen rack is at the end of the hopper. The upper part of the facade is provided with a discharge port, and a scraper is installed at the lower part of the discharging port; in the hopper, a roller is supported along its width direction, and the motor is connected with the dial roller through a speed reducer, and the other end of the hopper is provided with a feeding port. The rollers roll the material onto the scraper. The hoist can lift the hopper and the paint can be scraped evenly on the wall. The wall plastering machine has the advantages of simple structure, convenient operation, time saving and labor saving, and can ensure the quality of the coating, and is safe and efficient. Taking an automatic wall plastering machine with a scraper width of 1 meters as an example, its coating efficiency is more than 8 times that of manual labor.