Membrane-based sewage nitrogen and phosphorus removal system

The invention discloses a membrane-based sewage nitrogen and phosphorus removal system which comprises an anaerobic tank, an aerobic tank and an aeration membrane reaction tank. The aeration membranereaction tank comprises a tank body, an aeration pipe frame and hollow fiber membrane filaments. The aeration pipe frame comprises a pipe dividing frame and branch pipe frames, and the hollow fiber membrane filaments of a triangular prism structure are arranged on the branch pipe frames. An anaerobic pipe frame is arranged between the inner sides of every two adjacent rows of branch pipe frames, aerobic pipe frames are arranged on the inner wall, close to the outer sides of the hollow fiber membrane filaments, of the tank body, and the anaerobic pipe frames and the aerobic pipe frames are correspondingly provided with liquid spraying heads respectively. The anaerobic tank is communicated with the tank body through the anaerobic pipe frames, the aerobic tank is communicated with the tank body through the aerobic pi