A method is proposed in this study to create a flat-top pulsed magnetic field through the combination of Sequentially Fired Pulse Forming Network (SFPFN) and the correction of the magnetic field by a compensation coil. First, a background flat-top pulsed magnetic field is generated by the SFPFN, and then it is corrected by a compensation magnetic field circuit composed of IGBT, compensation coil, and crowbar circuit to achieve a high-stability flat-top pulsed magnetic field. Simulations conducted in Simulink and Saber yielded a flat-top pulsed magnetic field with a magnetic field strength of 45.1 T, a flat-top duration of 27 ms, and a magnetic field stability of less than 400 ppm, preliminarily verifying the feasibility of the proposed scheme.