Rectangular fall prevention well lid

The invention discloses a rectangular fall prevention well lid which comprises a mounting seat, a square well lid, a locking component, a plurality of fall prevention components and a lid plate. The locking component is arranged on the bottom surface of the well lid and comprises a threaded lifting shaft, an inclined wedge shaft and four locking rods, and the fall prevention components are arranged on the mounting seat and comprise first springs and fall prevention vertical rods. The well lid is locked by the locking component, so that the lid cover cannot be stolen and opened by water flow ina flushed manner in stormy weather and can not loosen, the fall prevention vertical rods are automatically ejected from containing holes under the elastic functions of the first springs when the lidcover is taken away or opened by water flow in a flushed manner, warning effects are achieved, passengers are effectively reminded, falling down of the passengers caused by carelessness is avoided, risks are greatly reduced, t