The invention discloses a control method for a three-level power amplifier. The power amplifier comprises a power switching bridge circuit with an upper bridge switching tube and a lower bridge switching tube, and an electromagnetic bearing coil Lm connected between the two switching tubes. The control method is characterized by comprising the following steps: (1) during charging, switching on/off the upper bridge switching tube under the control of a corresponding driving signal, and keeping the lower bridge switching tube in a switch-on state; and (2) during discharging, switching on/off the lower bridge switching tube under the control of a corresponding driving signal, and keeping the upper bridge switching tube in a switch-off state. According to the method, control over the current of the electromagnetic bearing coil is realized through adoption of different ways for adjusting the upper bridge switching tube and the lower bridge switching tube, so that a conventional way of controlling the upper and lower switching tubes with a phase inverter is changed, and the control way is simpler.