The invention relates to an inverter bus voltage control method, which comprises the following steps: setting a bus voltage level threshold value in advance according to state parameters of an inverter, and setting the bus voltage level of the inverter to be high if the bus voltage of the inverter is greater than or equal to the bus voltage level threshold value, or otherwise, setting the bus voltage level of the inverter to be low; monitoring the bus voltage of the inverter; and according to the absolute value of the difference between the bus voltage of the inverter and a given reference voltage and the bus voltage level of the inverter, determining coefficients related to direct-current bus voltage control in a DC input control loop and an inverter output control loop of the inverter, and optimizing and controlling the bus voltage of the inverter by dynamically adjusting the DC input control loop and the inverter output control loop. According to the invention, the dynamic responsespeed of the bus control loop can be increased on the premise of meeting the requirements of the input and output characteristics of the inverter, so that the specification allowance of the selected bus capacitor is reduced, the use efficiency of the bus capacitor is improved, and the cost of the inverter is reduced.