The invention belongs to the technical field of electric meters, and particularly relates to an electric meter. The electric meter comprises a first mounting plate, mounting holes, a second mounting plate, first springs, guide rods, an electric meter shell, a left shell body, a right shell body, a limit slot seat, an L-shaped inserting plate, nuts, first connecting blocks, threaded rods, a limit rectangular sleeve, a drying strip box, a desiccant layer, a filter screen, a control switch, a transparent plastic plate, an elastic limit rod, a fixing circular block, a circular sleeve, a second spring, a movable rod, a third spring, a round bar, a rectangular block, casings, tubes, a micro fan, a mounting frame and second connecting blocks. Through the cooperation of a rotation limit structure,the inserting plate and the limit slot seat, a limit function can be provided, and installation can be realized. The limit can be cancelled only by pressing and rotating the elastic limit rod to makethe elastic limit rod not contact the electric meter shell. Thus, convenience is brought to the installation and removal of the electric meter. The electric meter is simple to operate and convenientto use.