The suction truck is a new type of environmental sanitation vehicle that collects, transfers, cleans, and transports sludge and sewage to avoid secondary pollution. The suction truck can self suction and discharge, with fast working speed, large capacity, and convenient transportation. It is suitable for collecting and transporting liquid substances such as feces, mud, and crude oil. The suction truck adopts a domestically advanced vacuum pump with high suction force and long suction distance, which is particularly suitable for the suction, transportation, and discharge of sediment in sewers, especially for large objects such as sewage mud, sludge, stones, bricks, etc.