The invention discloses a membrane SBR bioreactor for a scattered sewage treatment. The front end of the membrane SBR bioreactor is connected to a pre-sedimentation tank. The membrane SBR bioreactor comprises a reaction tank and a membrane module. On the basis of a conventional SBR technology, a membrane module is adopted to replace the precipitation technology, the sludge concentration and effluent quality are effectively improved during the operation process of the SBR bioreactor, furthermore, the SBR bioreactor replaces multiple tanks in the conventional SBR technology, and the occupied space of the equipment is reduced.