The invention discloses a self-propelled mobile drainer, which structurally comprises wheels, a driving shaft, a substrate, a ventilating slot, a draining system, a top shell cover, a water inlet hole, a fixing device, a repair door, a link rod, and an engine; there are four wheels totally and evenly installed at left and right ends of the driving shaft and mechanically connected with the link rod; the driving shaft horizontally crosses through the middle part of the wheel and electrically connected with the engine; the substrate is vertically fixed at the lower end of the draining system, andthe substrate is collinear with the axis of the top shell cover. The draining system is composed of a water outlet, a big gear, a small gear, a first spring, a driving rod, a supporting bracket, a counterweight, a flow tube, a floating cylinder, a main body, a hydraulic rod, a splint, a second spring, a limiting block, and a reservoir pond; the self-propelled mobile drainer can realize that the longitudinal draining pipeline is short in length, big in paving slope and can meet the self-clean of water flow during the process of draining in the pipe, thus the pipeline can be timely found and maintained even though the pipeline is blocked.