The utility model relates to a falling preventing device for a hanging basket of an elevator, comprising ear plates on a cross beam of a hanging basket, bearing shell seat frames, clamping mechanisms with inclined surfaces. Channel plates with inclined surfaces of the two mechanisms are fixed on a fixed plate, clamp chewing blocks of the two channel plates are correspondingly contained beside the side surfaces of a vertical rail for the hanging basket, the two blocks are hinged on gears through hinges and the connecting rods thereof, and the two gears are engaged with a double-face rack which is hinged and fixed on the shaft end face of a shifting shaft through a cardinal shaft and a bolt; the shaft is extended from a falling guide slot hole of the plate and is positioned at the upper end of the hole, the shaft is suspended and connected to the shaft by a compression spring, so that the entirety of the clamping mechanisms can be supported. When the shaft falls down along with the hanging basket, the gears and the connecting rods can be driven by the rack, so that the clamp chewing blocks on the channel plates with inclined surfaces can be moved up and clamped on the upright rail for the hanging basket, and accordingly, the effect of preventing falling and the effect of fixing can be realized.