The invention discloses an 
ultrafiltration membrane self-cleaning device, which relates to the technical field of water purification; specifically, it includes a filter 
cartridge holder, an 
ultrafiltration membrane filter cartridge and a 
water storage tank, and the inside of the filter 
cartridge holder is fixedly installed with multiple groups  springs, and a filter cartridge fixture is installed between each group of springs, and the 
ultrafiltration membrane filter cartridge is fixedly installed between two adjacent filter cartridge fixtures, and the top of the ultrafiltration 
membrane filter cartridge is installed with a 
raw water inlet 
pipe,  And the other end of the 
raw water inlet 
pipe is equipped with a water inlet three-way 
solenoid valve.  In the present invention, the 
purified water in the 
water storage tank is introduced into the ultrafiltration membrane filter cartridge to backwash the ultrafiltration membrane, wherein the 
purified water in the 
water storage tank contains air bubbles introduced by the 
air pump, and the micro bubbles are used to 
impact and burst in the ultrafiltration membrane  , to effectively improve the cleaning of 
dirt and impurities on the surface of the ultrafiltration membrane. At the same time, the ultrafiltration membrane filter cartridge is driven to vibrate during 
backwashing, and the vibration is used to speed up the speed of 
dirt shedding, thereby improving the efficiency and quality of ultrafiltration membrane cleaning.