In some specific areas, high-voltage and multiple ports output are required to supply power at the same time. Multi-output converter is widely used in practical applications because of its advantages of simple circuit, high dependability and low cost. However, there is a problem of cross adjustment rate. In order to fundamentally solve the cross adjustment rate of the multi-output converter, a new multi-output converter is proposed. The magnetic decoupling transformer (MDT) is used to remove the coupling between each output, so that each output can be controlled separately. Finally, the integrated magnetic model is built in Simulink and Maxwell for simulation verification. The simulation results verify the correctness and effectiveness of the method.