Water diversion tank

The utility model provides a water diversion tank which comprises a tank body, a water inlet, a sewage disposal port and a water outlet are sequentially formed in the upper height position, the middle height position and the lower height position of the surface of the tank body, and a pressure gauge is installed on the water outlet. A trash holding grid is obliquely arranged in the tank body relative to the position between the water inlet and the water outlet, the top of the lower end of the trash holding grid is flush with the inner bottom wall of the trash cleaning opening, and a sealing door is arranged at the outlet position of the trash cleaning opening. According to the structure, the drain grating is arranged in the water diversion tank, the pressure gauge is installed at the water outlet to monitor the pressure of the water outlet side, the accumulation condition of impurities on the drain grating is fed back through the pressure difference displayed in front and back of the pressure gauge, the probl