System capable of preventing unauthorized opening of ammeter box

The utility model discloses a system capable of preventing unauthorized opening of an ammeter box comprising an ammeter box, a box door opening/closing monitoring alarming unit, and an alarming monitoring center. The box door opening/closing monitoring unit is disposed in the ammeter box, and is used for sending the alarm information to an alarm monitoring center, when the box door distance is inconsistent with the set distance value of the box door in the closed state. The system is advantageous in that the opening state/closing state of the ammeter box door can be timely and accurately detected, the electricity stealing behavior can be effectively reduced and prevented, and the supervision strength of the electric power department can be guaranteed.