Falling preventing device of parking device

The utility model discloses a falling preventing device of a parking device. The falling preventing device comprises a jack catch with one end hinged to a rotating shaft. The other end of the jack catch is provided with a jack catch sharp end. The lower portion of the jack catch sharp end is provided with an ejector shaft in a hinged mode. A chain presses one side of the ejector shaft tightly. One side of the chain is provided with a clamping plate. The rotating shaft is arranged on a lifting sliding sleeve, the rotating shaft is sleeved with a torsional spring, one end of the torsional spring abuts against the inner wall of the lifting sliding sleeve, and the other end of the torsional spring is connected with the jack catch. The chain presses the ejector shaft tightly, pressure is exerted on the ejector shaft, after the chain is fractured, the ejector shaft is not subjected to the pressure exerted by the chain, the torsional spring releases elastic force to enable the jack catch sharp end to be upwarped, the jack catch sharp end is clamped in a clamping groove of the clamping plate, and therefore the lifting sliding sleeve can be prevented from falling, the safety of vehicles, equipment and workers is guaranteed, and the falling preventing device is compact in structure, fast in response, safe and reliable.