The hydraulic wet spraying machine has obvious advantages such as low operating dust, less spraying rebound, protecting the working environment, saving raw materials, and improving the quality of the spraying layer. Adopting hydraulic pumping, the system has high reliability and stable delivery capacity, ensuring fast, uniform, and stable shotcrete operations. The hydraulic wet spraying machine uses the main motor to drive the hydraulic pump to generate power, causing the pistons of two working cylinders to alternately move back and forth, causing one working cylinder to suck in materials and the other working cylinder to push materials. Each cylinder is connected to each other, causing the concrete inside the working cylinder to be pushed out and enter the mixed flow pipe through the S pendulum tube. After being blown by compressed air at the mixed flow pipe, it reaches the nozzle through the conveying pipe, and a certain proportion of accelerator is sprayed at the nozzle. After mixing, spray directly on the surface to be sprayed.