The utility model discloses a theftproof nose locking device based on distribution electric power room, it includes the action bars and the right side, the left side board, be equipped with lock box and first lock nose on the board of right side, the action bars passes first lock nose and stretches out to the left side with the lock box, the pickproof lock has been articulated on the action bars, the lock box is inside hollow cuboid structure, lock box right side is formed with the opening, the bottom is formed with the operation groove of rectangle, the inside open -ended one side upper portion that is close to of lock box is equipped with the shutting board, shutting board middle part is formed with one and can supplies action bars and catch to pass and forbid the shutting groove that the lock body passed, be equipped with on the action bars and seal lock box open -ended guard plate, be equipped with two second lock noses on the board of left side, and the action bars can insert smoothly in two second lock noses. The utility model provides the security that has risen the switching lock has avoided the violence to destroy the possibility that distribution equipment was stolen to the lock, has reduced the change frequency of lock simultaneously, has practiced thrift the lock cost, has promoted the stability of equipment operation.