The invention provides an inverter virtual impedance vector diagram analysis method. The size and nature of output impedance at the fundamental frequency of an inverter are analyzed under different types of virtual impedances added. By introducing virtual impedance, the size and nature of the original output impedance of an inverter can be changed, and an inverter output impedance can be acquired as needed. A virtual impedance module is added on the basis of the original voltage and current double-closed-loop feedback control system. The adopted current feedback is inductive current feedback. Thus, the change in output impedance at the fundamental frequency of an inverter under five conditions, namely, adding virtual positive inductance, adding virtual negative inductance, adding virtual positive resistance, adding virtual negative resistance, and adding virtual complex impedance composed of virtual positive resistance and virtual negative inductance, can be analyzed and verified based on a vector diagram and a corresponding Bode diagram.