The utility model discloses a device for plugging an electric energy meter without power off. The device comprises a pedestal, a contact bridge, a plug, a push rod and a support, wherein the contact bridge, the plug, the push rod and the support are mounted on the pedestal. The pedestal is provided with threaded holes, pedestal jacks, a stop end surface and a first inclined surface; the contact bridge is provided with circuit holes and contacts; the plug is provided with a lead hole, a plug jack and a contact surface; and the push rod is provided with a projection, a limiting end surface, a second inclined surface and a push head. The second inclined surface is arranged on the first inclined surface, the limiting end surface abuts against the stop end surface, an elastic piece is mounted between the push rod and the pedestal, the support is provided with cylinders, springs are mounted on the cylinders respectively, one end of each spring abuts against the contact bridge, the contacts make surface contact with the contact surface, the push rod is provided with an end surface, and the end surface abuts against the contact bridge. When the electric energy meter needs to be replaced for different reasons, the device can be used to replace the electric energy meter without power off, the device has great significance in practical application, and the power utilization continuity of users can be ensured.