The utility model provides a foldable footrest. The device comprises an arc-shaped bottom plate, two bottom plates are provided, sliding grooves are formed in the side walls of the opposite sides of the two bottom plates. The sliding grooves are bent upwards and then rotate to form limiting grooves, fixed hinge plates are hinged to the two ends of the connecting shaft, synchronous hinge shafts arearranged in the middles of the fixed hinge plates, movable hinge plates are movably hinged to the synchronous hinge shafts, the bottoms of the movable hinge plates are movably installed in the corresponding sliding grooves through pulleys, and the hinged movable hinge plates and fixed hinge plates form an X shape. The tops of the two movable hinge plates are connected and fixed through a second fixing shaft, the tops of the two fixed hinge plates are connected and fixed through a first fixing shaft, and a foot rest net is connected between the second fixing shaft and the first fixing shaft. After the scheme is adopted, the structure is reasonable, and the use effect is good.