Protection device capable of prolonging service life of metering box of electric energy meter

The invention, which belongs to the technical field of electric facilities, discloses a protection device for a metering box of an electric energy meter. The protection device comprises a metering boxbody and a return mechanism. The metering box includes a box body and a box door; a rotating shaft is fixed at the box body; and a sleeve is fixedly arranged at the box door. The return mechanism consists of a first reset torsion spring and a first damping assembly; the first reset torsion spring is connected with the rotating shaft and the sleeve, so that the box door has a trend of rotating relative to the box body and sealing an open end; and the first damping assembly includes two first damping rings that are in contact with each other and are used for limiting the rotation speed of the box door relative to the box body. According to the protection device provided by the invention, the box door can be closed automatically and the open end of the box body can be sealed and thus the electric energy meter is in