The flood control mobile drainage pump truck can suck and discharge liquids containing large solid particles and long fiber impurities, and can be widely used in municipal sewage and flood control projects, agricultural irrigation, etc. The pump unit has the characteristics of a simple structure, good self-priming performance, strong sewage discharge capacity, high efficiency and energy saving, easy use and maintenance, and integrated or outdoor movable design. This product is more convenient and flexible than a fixed diesel engine pump and is easy to move to suit different places. High-quality domestic or imported diesel engines can be selected according to different working conditions and matched with high-quality and efficient self-priming centrifugal pumps.