Several rings of nanofilter-grade ceramic membrane are installed on the rotor. After the slurry is injected into the closed slurry tank, the rotor is slowly rotated. At the same time, due to vacuum suction, the filtrate passes through the membrane layer and enters the filtrate tank from the distributing valve. When the filter cake reaches a certain level, it is automatically discharged, so that the filter cake is obtained. After running for a period of time, the filter plate can be cleaned by backwashing, ultrasonic wave and low concentration acid. The core element that plays the role of separation, the filtration accuracy of the membrane reaches the ultrafiltration level. The filtration, draining, drying and unloading processes are continuous.