Addressing the switching operation problems of complex operation, low efficiency, and potential safety hazards in a power system, a flexible power system switching regulator with load is designed. This device mainly adjusts the voltage of two independent buses for power distribution, so that a gradually changing current is generated between the two buses. Over time, the voltage values of the two buses tend to be equal to achieve parallel operation. The mathematical model and topology of the flexible switching device are designed. The abc-dq transformation is used to control the current inner loop control of feedforward decoupling and the voltage outer loop control of PI regulation. The rapidity and accuracy of the control strategy are verified by Matlab/Simulink simulation. This strategy can ensure the reliability for users and improve switching operation efficiency. This work is supported by National Natural Science Foundation of China (No. 51974151) and Guiding Program of Liaoning Natural Science Foundation (No. 201805500438).