The invention relates to the field of safety devices for banks, in particular to a safety box device which can be prevented from being unlocked violently. The safety box device which can effectively solve the problem that the conventional safety box is unlocked violently through a weak area comprises a box body of which at least one side is provided with a box door, wherein the box door is provided with a box door locking system; the box door locking system comprises a movable bolt for locking the box door and the box body, and a fragile part fixedly arranged on the inner side face of the boxdoor; the fragile part controls at least one safety pin; and when the fragile part is broken, the safety pin keeps the movable bolt in a locked state. The improved safety box can perfectly solve the problem of the weak area in the conventional safety box, has low cost and high reliability.