The utility model provides an ammeter box, include: casing, casing include case main body and switch door, but the first side of switch door is not connected with case main body pivot ground, the ammeter, the ammeter setting is in the casing, entrance guard's device, the second side of switch door is through entrance guard's device and case main body cooperation to be in the same place switch doorand entrance guard's device lock, entrance guard's device is read the card system and is connected with control system in order to carry out the record to the people's information of opening the doorincluding reading card system and control system. The technical scheme of the utility model the problem of hardly traceing back among the prior art has been solved effectively in switch ammeter box.