In order to solve the output unbalance of the flyback switching power supply of the washing machine controller, through using the false load, and the feedback loop with PC817 and TL431 by mainpole compensation. Simulation and measurement results show that 12 V fluctuation can be controlled within 10%,When 12 V emptyload and 5 V fullload;5V fluctuation can be controlled within 2% range, When 12 V fullload and 5 V emptyload; The twoway output voltage fluctuation can be controlled within 2% range, the practical application shows that the flyback switching power supply is feasible and effective.