Safety hammer

The utility model provides a safety hammer capable of quickly cracking automobile glass down with safety. A metal hammer head and a plastic hammer handle are orderly connected with each other. To improve motion speed of the metal hammer head, a round hole is formed in the tail end of the plastic hammer handle; the tail end leaves far away from the hammer head; the round hole is a finger sleeve ring; a finger can move in the finger sleeve ring; during the use, the middle part of the finger is covered with the finger sleeve ring and the finger is formed in a hook shape; a thumb extends on one side of the finger to block the hammer handle; the other three fingers are accumulated on the other side of the finger; an arm is lifted; a conical tipped end of a lifesaving hammer head faces right the automobile glass and then hit the same; and meanwhile, with the finger sleeve ring covering the finger as an axis, the thumb presses hard on the hammer handle toward a hitting direction of the arm, so speed of the hammer head is increased and the automobile glass can be cracked.