The invention relates to an LCL-type grid-connected inverter parallel connection virtual impedance control method. Under weak grid conditions, a parallel connection virtual impedance control method isprovided, difference is solved between grid-connected current ig and grid-connected instruction current parameters iref to obtain a signal ei, then difference is solved between the signal ei and a current signal fed back by an inverter side virtual impedance Zp(s), a and after double-current feedback control, a PWM modulating wave signal is generated to be transmitted into a PWM generator to generate a switch signal. After parallel connection virtual impedance, a system phase margin is increased, a harmonic is obviously lowered, the robustness and the interference resisting capability of thesystem are effectively improved, it is guaranteed that grid-inlet current is not greatly influenced by grid resistance, a parallel connection inverter can still normally work under the change of gridresistance wide ranges, the harmonic is small, and the applicability is good; in the dynamic response process of transforming a half load to a full load of the grid-connected virtual impedance, compared with a traditional method, the transition time is shorter, the overshooting amount is reduced, and stable running of a grid-connected inverter system is not influenced.