Non-resistance self-draining backflow prevention flood drainage device

The invention discloses a non-resistance self-draining backflow prevention flood drainage device. The non-resistance self-draining backflow prevention flood drainage device mainly comprises a drainingwell, a water inlet pipe and a gravity drain pipe, and the water inlet pipe and the gravity drain pipe are arranged on the sidewall of the draining well. The bottom surface of the draining well is lower than the lower ends of the water inlet pipe and the gravity drain pipe. The non-resistance self-draining backflow prevention flood drainage device is further provided with a water collecting tankarranged beside the draining well. An overflow weir is arranged between the draining well and the water collecting tank, and the draining well and the water collecting tank are separated through the overflow weir. Water pumps are arranged in the water collecting tank and used for pumping water in the water collecting tank. A water pump drain pipe is connected to the water outlet ends of the waterpumps. A water outlet of th