The utility model relates to a tail pipe residual liquid recovery device for a sewage tank truck, which comprises a drain valve, a drain pipe, a water return valve, a water return pipe, a sewage control valve, a recovery tank, a blowdown valve, a drainage pipe, an emptying valve, a gas inlet valve, a gas pipeline, a gas control valve and a gas cylinder. The recovery tank of the tail pipe residual liquid recovery device is installed at the side surface tail part of the tank truck; the sewage control valve and the emptying valve are arranged at the top part of the recovery tank; and the sewage control valve is connected with the drainage pipe through the water return pipe and the water return valve. The gas inlet valve is arranged at the upper part of the recovery tank and connected with the upper part of the gas cylinder through the gas pipeline and the gas control valve. The drainage pipe is arranged at the lower part of the recovery tank and enters a filling port upwards; and the blowdown valve is arranged at the bottom of the recovery tank. The utility model has the benefits that the tail pipe residual liquid recovery device is simple in structure, low in cost and convenient in operation, the quick recovery of tail pipe residual liquid of the sewage tank truck is realized, the problem that the tail pipe residual liquid of the sewage tank truck spatters on the ground to pollute the environment is solved, the clean production is realized, the phenomenon that sewage spatters on a pavement to cause slippery road is avoided, and the occurrence of traffic accidents is prevented.