With the increasing battery capacity and growing demand for fast charging in electric vehicles, the application prospects of MW-level electric vehicle charging systems are vast. However, existing detection systems struggle to meet the rated current excitation requirements of MW-level chargers, resulting in poor compatibility and long testing cycles. In response to these challenges, a novel experimental method of measured-simulated inversion correction is proposed in this paper, based on the equivalent model of the shifted phase full-bridge topology and involving continuous adjustment of the rated module simulation model and data using finite module measured data. A new approach for detecting the output characteristics of MW-level chargers on existing test platforms is thereby provided.