Automatic flood control wall for underground space

The invention discloses an automatic flood control wall for an underground space. The automatic flood control wall comprises a flood control baffle; the flood control baffle is installed on a main body structure; a water storage tank is arranged below the main body structure; and a water storage tank drainage controller is arranged at the bottom of the water storage tank. When the water depth in front of a deceleration strip does not exceed the top of the deceleration strip, the water storage tank drainage controller is in an on state, and accumulated water generated by daily urban watering maintenance and the like enters into a water tank and can be drained immediately, so that the situation that the flood control wall is opened by mistake is effectively prevented, meanwhile, manual opening in emergency situations is supported, and reliability is high; according to the automatic flood control wall for the underground space, gravity and water buoyancy action characteristics and a floating ball device principl