The invention discloses a voltage source inverter control method for decoupling electric current in a virtual synchronous coordinate system. The method comprises the step of conducting error PI adjustment and decoupling compensation calculation on dq axis current outputted by an inverter in a virtual synchronous rotating coordinate system, so that an AC output voltage command can be directly generated. The control method disclosed by the invention can eliminate a phase-locked loop link aiming at detecting the phase and the frequency of the rotating vector of grid voltage, and has obvious self-adaptability to frequency deviation; and furthermore, the control method can also be used for supplement and extension of a vector control method based on grid voltage orientation under the condition of deviation of voltage phase and frequency detection. According to the voltage source inverter control method, a grid voltage phase-locked loop is eliminated, the control design of a voltage source inverter is simplified, and the system computing burden and the realization complexity are reduced.