The invention discloses a grid-connected inverter control method based on improved proportion quasi-resonance control. The grid-connected inverter control method comprises the following steps: takingthe difference between a command signal and the actual output current of an inverter as the input signal of a base frequency quasi-resonance controller, taking the output signal of the controller as input signals of a proportion controller and a high frequency quasi-resonance controller, and after adding the output signal of a high order quasi-resonance controller and the output signal of the proportion controller, subtracting with the output signal of the base frequency quasi-resonance controller to obtain a total output signal for controlling the modulated wave of the drive signal of the inverter. An actual output signal is directly taken as the input of a proportional step, so that the dynamic response speed of the controller is improved; a high frequency quasi-resonance step is added so as to inhibit high order harmonic interference in the command signal, the extraction capacity for base wave signals is improved, the method has good anti-interference capacity, the method is beneficial for various optimal designs of grid-connected inverter closed-loop control by using alternating quantity as the command signal, and the method has preferable practicability and practical value.