The PWDDFL multi suction head sewage pump adopts a single (double) channel and single (double) blade structure, which is an improvement of the technology of the liquid spring pump valve in the underwater sewage pump. It has a non blocking hydraulic design, no leakage, compact structure, small footprint, stable operation, low vibration, high reliability, easy installation, convenient operation and automatic control. Compared to other sewage pumps, the price of multi suction head sewage pumps greatly improves efficiency and reduces costs.