A method for suppressing bias magnet, comprising: acquiring a bus voltage U1 in a case of a forward excitation of a transformer in a direct current-direct current, DC-DC, converter and a bus voltage U2 in a case of an inverse excitation of the transformer in the DC-DC converter; determining a bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and a bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer according to the bus voltage U1 in the case of the forward excitation and the bus voltage U2 in the case of the inverse excitation; and adding the bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and a loop-output duty cycle signal quantity of the DC-DC converter and outputting an adding result to a switch transistor in a forward excitation, and adding the bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer and the loop-output duty cycle signal quantity of the DC-DC converter and outputting an adding result to a switch transistor in an inverse excitation; wherein the method is characterized in that determining the bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and the bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer according to the bus voltage U1 in the case of the forward excitation and the bus voltage U2 in the case of the inverse excitation comprises: obtaining a voltage difference ΔU1 between the forward excitation of the transformer and the inverse excitation of the transformer according to the bus voltage U1 in the case of the forward excitation and the bus voltage U2 in the case of the inverse excitation; determining a compensation information amount ΔU3 according to the voltage difference ΔU1 between the forward excitation of the transformer and the inverse excitation of the transformer; and determining the bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and the bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer according to the compensation information amount ΔU3. acquiring a bus voltage U1 in a case of a forward excitation of a transformer in a direct current-direct current, DC-DC, converter and a bus voltage U2 in a case of an inverse excitation of the transformer in the DC-DC converter; determining a bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and a bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer according to the bus voltage U1 in the case of the forward excitation and the bus voltage U2 in the case of the inverse excitation; and adding the bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and a loop-output duty cycle signal quantity of the DC-DC converter and outputting an adding result to a switch transistor in a forward excitation, and adding the bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer and the loop-output duty cycle signal quantity of the DC-DC converter and outputting an adding result to a switch transistor in an inverse excitation; wherein the method is characterized in that determining the bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and the bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer according to the bus voltage U1 in the case of the forward excitation and the bus voltage U2 in the case of the inverse excitation comprises: obtaining a voltage difference ΔU1 between the forward excitation of the transformer and the inverse excitation of the transformer according to the bus voltage U1 in the case of the forward excitation and the bus voltage U2 in the case of the inverse excitation; determining a compensation information amount ΔU3 according to the voltage difference ΔU1 between the forward excitation of the transformer and the inverse excitation of the transformer; and determining the bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and the bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer according to the compensation information amount ΔU3. obtaining a voltage difference ΔU1 between the forward excitation of the transformer and the inverse excitation of the transformer according to the bus voltage U1 in the case of the forward excitation and the bus voltage U2 in the case of the inverse excitation; determining a compensation information amount ΔU3 according to the voltage difference ΔU1 between the forward excitation of the transformer and the inverse excitation of the transformer; and determining the bias magnet compensation amount Δd1 in the case of the forward excitation of the transformer and the bias magnet compensation amount Δd2 in the case of the inverse excitation of the transformer according to the compensation information amount ΔU3.