Hidden city flood prevention wall

The invention discloses a hidden city flood prevention wall comprising a plurality of door bodies which are adjacently arranged, and the fracture surfaces of the door bodies are in the shape of inverted T; each door body comprises a water blocking door plate and wing plates located at the bottoms of the back side and the front side of the water blocking door plate; the wing plates are perpendicular to the water blocking door plates; the bottoms of the water blocking door plates are fixed to the top of one side of a water drainage ditch through a plurality of rotating supporting hinges; the water blocking door plates can rotate to the side of the water drainage ditch by 90 degrees from the erected state; when the water blocking door plates rotate to the side of the water drainage ditch by 90 degrees and are in a laid-down state, the water blocking door plates are flush with the municipal road ground; a plurality of telescopic supporting rods are connected in the wing plates of the bottoms of the back sides of