Concrete wet spraying machine is a kind of construction equipment widely used in engineering construction. It uses compressed air or other power to transport the mixed material in a certain proportion through the pipeline and spray it at a high speed to the sprayed surface to condense and harden, thereby forming a concrete support. The protective layer, shotcrete technology is simple, the construction cost is low, the adaptability is wide, the operation dust is small, the spray rebound is less, the protection of the working environment, the saving of raw materials, and the improvement of the spray layer quality have played an important role in various construction fields.