Comprehensive water saving system with sewage treatment function

The utility model discloses a comprehensive water saving system with the sewage treatment function. The comprehensive water saving system comprises a sewage discharge device, a water collection tank, a water storage tank, a pipeline and a water pump, wherein the sewage discharge device is connected with the water collection tank through the pipeline; the water pump is connected with the water collection tank and the water storage tank; a water outlet is formed in the water storage tank; the water collection tank comprises a tank body, a coarse filter screen, a fine filter screen and a sedimentation mesh; the coarse filter screen is arranged at the upper part of the tank body; the fine filter screen is arranged below the coarse filter screen; the sedimentation mesh is arranged at the bottom of the tank body; the comprehensive water saving system further comprises a toilet; the toilet is connected with the water outlet through the pipeline. The sedimentation mesh is arranged at the bottom of the water collectio