The utility model relates to a that pops out automobile -used saucer of formula prevents gravity automatic unlocking device, including casing and saucer upper cover plate, saucer upper cover plate slidable mounting in the casing, the medial surface of saucer upper cover plate go up the middle part and stretch out the arrow point portion that has arranged, the inboard lateral wall relative with arrow point portion of casing on install the hasp between two parties, the arc wall of salient on the lateral wall of casing is arranged to one side of this hasp, the medial surface of saucer upper cover plate go up and to install can be at spacing board of the vertical plane internal rotation at arc wall place with the corresponding position of arc wall, the marginal and arc wall of the outside arc of this spacing board matches. The utility model discloses simple structure, simple to operate is reliable, and the location is accurate, has improved the dismouting efficiency of light greatly.