The invention relates to an automatic regional dustproof water spraying device for construction in a metro station. The automatic regional dustproof water spraying device is characterized by consisting of a water storage tank, a water pump, a water pump control box, a pressure gauge, sluice valves, check valves, a pressure stabilizing tank, an electric contact pressure gauge, a dust fall unit, a valve control box and a three-way pipeline. One sluice valve, one check valve, the pressure gauge, the water pump, one sluice valve and the water storage tank are mounted on one branch of the three-waypipeline in sequence; one sluice valve and the pressure stabilizing tank are mounted on another branch of the three-way pipeline in sequence; the other check valve, the electric contact pressure gauge and the dust fall unit are mounted on the last branch of the three-way pipeline in sequence. The automatic regional dustproof water spraying device disclosed by the invention is scientific and reasonable in structural design, has the advantages of guaranteeing no smoke dust threat to the health of construction personnel, improving the construction progress, accelerating dust falling and improving the construction environment, is good in dust fall effect, convenient to operate and easy to implement, and is applied to the construction in the metro station.