The invention discloses an ore crushing device capable of protecting a lining plate against falling off. The core crushing device capable of protecting the lining plate against falling off is characterized by comprising a stainless steel crushing box body, reverse striking plates, reverse striking frames, a reinforcing lining plate, a crushing feeding inlet, a crushing base, plate hammers and a rotator frame; a protruded bolt head hook is installed in the middle of one side of the reinforcing lining plate, and a long groove is formed in the bolt head hook; a through hole matched with the bolt head hook is formed in the corresponding position of the stainless steel crushing box body, a bolt head of a bolt is placed in the bolt head hook, and a lining plate pressing cap is installed in the bolt head hook; and a nut is installed on the outer side of the lining plate pressing cap through a bolt. When the crushing device works, the bolt head of the lining plate is placed in the bolt head hook, and does not rub with stone materials in a crushing cavity, so that the bolt head is not damaged, the lining plate does not fall off the crushing cavity, and a machine is not destroyed, and accordingly, the service life of the lining plate is greatly prolonged; and in addition, the lining plate does not need to be replaced frequently, so that producing cost is effectively reduced, producing efficiency of the machine is improved, and producing cost is reduced.