Displacement prompting and emergency alarm device of on-vehicle safety hammer

The invention relates to a displacement prompting and emergency alarm device of an on-vehicle safety hammer, comprising a safety hammer arranged on a fixing bracket; the contact parts of the fixing bracket and the safety hammer are conductors, the contact points of the conductors at two ends of the fixing bracket are conducted by a metal part of the safety hammer; the contact point of the conductor at one end of the fixing bracket is connected with an automobile power supply, and the contact point of the conductor at the other end is connected with the input end of a relay; an acousto-optic alarm device is connected with the automobile power supply by a normally-closed contact point of the relay; the acousto-optic alarm device is also connected with the automobile power supply by sequentially passing through a normally-open contact point and an emergency button; the acousto-optic alarm devices are also arranged at the positions of a door and a driving operating floor, and are connected with the automobile pow