The utility model discloses a flushing device technical field's automatic flushing device of curb stone high pressure, including the watering lorry, be equipped with the water tank on the watering lorry, be bilateral symmetry on the water tank and be equipped with the booster pump, it is two sets of the aqueduct is all connected to the bottom of booster pump, and is two sets of all be equipped with first shower nozzle on the aqueduct, the inlet tube is connected to the left end of booster pump, the left end and the water tank of inlet tube are connected, be equipped with the hydraulic pressureball valve on the aqueduct, the right -hand member bottom of aqueduct is equipped with the water guide branch pipe, the second shower nozzle is established to the right -hand member of water guide branch pipe, the first low order end that spouts head position in the aqueduct, the below of first shower nozzle is equipped with curb stone, the second spouts the left side of head position in curb stone, be equipped with the spray tube on the first shower nozzle, this washing unit simple structure washes the effect well, and work efficiency is high.