This treatise develops a sort of cleaning machine that can clean the swimming pool. This device has changed the former manual cleaning method and accomplished the cleaning operation of all types of swimming pools safer and more convenient. It adopts the negative pressure adsorption principle and RO membrane to prevent the water being polluted the second time. The maneuver of the posture under the water is accomplished by controlling the water quality of the floating box. The operator manipulates and cleans on the shore. It accomplishs the on line and all-round cleaning under the water. The treatise mainly introduces the working principles of the cleaning machine and designs its constructure and analyzes theoretically and calculates the working property of the device.