The invention discloses a detachable movable flood gate which is composed of a detachable gate frame, an inclined support, a horizontal support and movable gate plates. The detachable gate frame is formed by welding two rectangular steel pipes through a straight plate, and a handle is arranged on the detachable gate frame. The inclined support is a rectangular steel pipe, and a handle is arranged on the inclined support. The horizontal support is formed by welding a rectangular steel pipe to two lugs and connected with the inclined support and a lead screw assembly below the inclined support, and a handle is arranged on the horizontal support. The detachable gate frame, the inclined support and the horizontal support are connected through three hinge points and are easy to detach, and all the parts are made of stainless steel. The at least one movable gate plate is arranged in the middle of the detachable gate frame and provided with a handle, thereby being convenient to dismount and mount. In addition, a fixed gate frame and a base are arranged. The detachable movable flood gate is suitable for serving as a water cut-off gate, a flood gate and an isolation retaining wall, saves the occupied land of a building, and has the advantages of being complete in structure, movable, high in water pressure resistance capacity, light in weight, convenient to use, rapid to install, convenient to dismount and mount, reusable, and convenient to convey and store.