The concrete rotor dry spraying machine is a common shotcrete equipment. Through the rotation of the rotor, the dry material enters the feed pipe at a certain speed and quantity, and then the compressed air transports the dry material to the nozzle, where it is mixed with water and sprayed onto the working surface. It has a compact structure and a small size, is easy to move and operate, and is suitable for use in various complex construction sites. It has a high spraying efficiency and can meet the needs of a certain scale of concrete spraying operations. At the same time, it has good sealing performance, which can effectively reduce dust flying, improve the construction environment, and reduce the impact on the health of operators. It is widely used in concrete spraying construction in tunnels, mines, building foundation pits and other projects.