A wet spraying machine is a device used for wet-jetted concrete, offering significant advantages over dry and damp spraying machines, such as reduced dust, less rebound, environmental protection, material savings, and improved coating quality. It's also easy to operate and maintain. Utilizing low-pressure, low-speed vortex air flow for material transport and close-range jetting, it overcomes issues like pipe blockage, pulsation, and segregation, resulting in uniform and stable material flow and enhancing the quality of the sprayed layer.