Abstract: According to the given measurement requirement of high frequency pulse magnetic field, a magnetic field measurement apparatus based on Faraday electromagnetic induction theory is developed. The paper details the design process and facture process. With the magnetic probe, a magnetic field signal with the frequency of 20k-30kHz is measured, and the magnetic distribution measurement result in an air-core pulse transformer is given. The result can reflect the actual magnetic field time-space distribution accurately, and act in accord with the simulation result.