The discharging device of the 1500l planetary mixer is sealed firmly, and the concrete material will not produce dust overflow and flying during the mixing operation, which reduces the pollution to the working environment and ensures the safety of the construction environment and the health of the construction workers. The high-pressure automatic cleaning device we have equipped for the planetary mixer on the cleaning device greatly improves the cleaning effect of the equipment, and the high-pressure rotary nozzle can clean the mixing device and the inner cylinder within a few minutes, which is clean and fast, and also saves a considerable part of labor cost.