Automatic drainage device capable of draining residual water and cleaning vehicle

The invention relates to the technical field of cleaning vehicles, in particular to an automatic drainage device capable of draining residual water and a cleaning vehicle. The invention provides an automatic drainage device capable of discharging residual water. The automatic drainage device comprises a blowing drainage system and a pipeline control system, the blowing drainage system comprises a Y-direction main water pipe, an air source, a connecting piece, an X-direction branch water pipe and a ball valve, the pipeline control system comprises a controller, a Y-direction linear driving assembly, a fixing plate, a push-pull rod and swing rods, the multiple swing rods can be synchronously driven to move through one Y-direction linear driving assembly, so that the push-pull rod moves, then the switch handle rotates, the cost is low, and the structure is simple. A mechanical structure is stably controlled in a water environment, a switch handle can rotate by 90 degrees, and when residual water needs to be disc