Magnetic coulombmeter shell structure capable of limiting opening

The utility model discloses a magnetic coulombmeter shell structure capable of limiting opening, which comprises a front shell, a circuit board, a rear shell, a main magnetic component and an auxiliary magnetic component, a cavity is reserved between the front shell and the rear shell after the front shell and the rear shell are mutually covered, and the circuit board can be placed in the cavity. The side, facing the front shell, of the rear shell is provided with an even number of extending bodies, when the rear shell and the front shell are closed in a covering mode, the extending bodies are all inserted into the front shell, wedge grooves are formed in the positions, right opposite to the extending bodies, of the side wall of an inner cavity of the front shell, and the main magnetic attraction assembly is arranged on the bottom wall of the wedge grooves. The circuit board attracts the magnetic induction block for the electromagnet, so that the wedge body is clamped with the wedge groove, the front shell an