Shell and membrane bio-membrane reactor

The utility model discloses a shell and a membrane bio-membrane reactor, and belongs to the technical field of sewage treatment. The shell comprises a hollow main body, an upper film fixing assembly located at the first end of the main body and a lower film fixing assembly located at the second end of the main body. Wherein the main body is used for accommodating the membrane assembly, and the upper membrane fixing assembly and the lower membrane fixing assembly are used for fixing the position of the membrane assembly; at least part of the upper film fixing assembly is located in the body. Afirst step part is arranged at the position, close to the first end, of the inner wall of the body, the outer diameter of at least part, located in the body, of the upper film fixing assembly is larger than the inner diameter corresponding to the first step part, and the height difference between the first end and the first step part is larger than or equal to the height of the lower film fixing assembly. The shell provid