A short-distance nitrification-denitrification biomembrane denitrogenation method for nitrogen containing sewage is disclosed. A biomembrane reactor having the following structure is adopted, wherein a cross plate a, a vertical plate b, a vertical plate c and a cross plate d are disposed in the reactor, the cross plate a separates the reactor into an upper part and a lower part, the lower part is a hydrolysis acidifying zone and the upper part is an A/O zone; the A/O zone is divided into three parts which are an aerobic zone O, a transition zone and an anaerobic zone A in order through the vertical plate b and the vertical plate c, the lower end of the vertical plate b is hermetically connected to the cross plate a, a water opening is between the upper end of the vertical plate b and the top of the reactor, the upper end of the vertical plate c is hermetically connected to the top of the reactor, a water opening is between the lower end of the vertical plate c and the cross plate a, the left end of the cross plate d is hermetically connected to the bottom of the vertical plate c, the right end of the cross plate d is hermetically connected to the wall of the reactor, and the transition zone is filled with palladium-copper loaded activated carbon catalyst particles. During sewage treatment, water is fed from the bottom of the reactor, passes through the hydrolysis acidifying zone, the aerobic zone, the transition zone and the anaerobic zone in order and discharged from the upper part. Biomembranes in each zone of the reactor are cultured separately, biomembranes with specific performance can be formed, film hanging is rapid and denitrogenation effects are good.