Underground parking garage deceleration strip device with water draining and blocking functions and method

The invention discloses an underground parking garage deceleration strip device with drainage and water blocking functions and a method. The underground parking garage deceleration strip device comprises a drainage deceleration strip fixed to a water storage tank, wherein drainage holes are formed in the drainage deceleration strip, outer side plates are arranged on the two sides of the water storage tank, a drainage pipe is arranged at the bottom of the water storage tank, and two ends of the water storage tank are connected to a lifting device; the water storage tank is arranged in a drainage tank below the underground garage deceleration strip, and rainwater is drained into an underground network pipe from a water storage tank drainage pipe through drainage holes of the drainage deceleration strip; the water level of the drainage tank is sensed through the sensor, the controller starts the lifting device to lift the water storage tank and the drainage deceleration strip integrally, and water blocking is co