Industrial self cleaning filter with fully sealed construction is a kind of filter element filtration equipment designed for the filtration of viscous materials. It is resistant to viscous biological material, has self-cleaning function and delivers high filtering accuracy. The filter element adopts thread connection, and can be made from PE or stainless steel. The self cleaning filter is easy to open the cover, and the filter element is easy to replace. The lower part of the self cleaning filter adopts pneumatic opening device and mechanical & pneumatic double locking device, which is easy to operate and ensures no leakage when working. The surface of inner wall is treated by mirror finishing and the outer wall is polished precisely.