Alternating magnetic field detection equipment, an 18-year design, positioning laboratory test equipment, according to IR46 international recommendations, requires intelligent automatic testing of the influence of alternating magnetic field on electric energy meters. Electric energy meter is an important measuring instrument related to energy saving and economic settlement, and is listed as the object of compulsory management by national measurement departments in all countries of the world. Compared with the traditional power frequency magnetic field test, the device greatly improves the working efficiency of the laboratory, reduces the operation risk of professional experimenters, and avoids the energy dissipation of high-end talents. The equipment can automatically control the position of the magnetic field coil, accurately control the vertical ± 180 ° rotation of the magnetic field coil and the horizontal ± 180 ° rotation of the electric energy meter, combined with various algorithms of the data processing terminal, through synchronous control of the position and related error calculation, quickly find the position corresponding to the maximum impact. The shell adopts sheet metal bending process, no mold is needed, and the processing cost is low; the electromagnetic coil shell part adopts modular design to reduce the size of local parts and facilitate installation and maintenance.