The invention discloses a rapid robustness single-current feedback control method of an LCL type grid-connected inverter. Single-current feedback control is introduced, a rapid robustness PWM modulation method is combined, and grid-connected control of the inverter is realized. According to the method, the grid-connected current is sampled, extra sensors are not needed, the hardware cost is reduced, and the system reliability is improved. According to the rapid robustness PWM control method, the duty cycle limitation is not introduced, the calculation time delay of one-step delay of a grid-connected current outer loop and an active damping inner loop is completely eliminated, the essential requirement that the positive and negative dividing frequency of an equivalent damping resistor is higher than the design range of the LCL resonant frequency is realized, the method allows half of the switching period of sampling and duty cycle calculating time, and the overall robustness and the dynamic performance of the grid-connected inverter are enhanced.