The utility model discloses an aircraft lavatory sewer piping cleaning system. This cleaning system is connected with aircraft lavatory sewer piping through external pipeline, forms circulation circuit, makes the sewer piping cleaner circulate in sewer piping under the effect of pressure to reach the abluent effect of aircraft sewer piping detergent. The utility model discloses a system can adopt negative pressure principle work, also can adopt the work of malleation principle, accomplishes that the circulation is clean, clear effectual, efficient. The utility model discloses a system is applicable to the various models of existing operation, and the whole in -process of system's operation does not need artifical the participation, and operating duration is short, and the security is high.