The invention provides a vibration starting loop and a control method thereof. The vibration starting loop comprises a parallel vibration starting loop and a series vibration starting loop, a switch K1 and a switch K2; The series vibration starting loop is connected in parallel with the switch K1 and then connected in series with a microgrid system, and the parallel vibration starting loop is connected in series with the switch K2 and then connected in parallel with the microgrid system; The parallel vibration starting loop and the series vibration starting loop are all reactance adjustable circuits. The vibration starting loop does not have coupling phenomenon with the tested power electronic equipment so as to avoid interference to the tested power electronic equipment and improve the accuracy and the stability of the tested power electronic equipment; The devices adopted in the vibration starting loop are all passive devices which do not generate interference to the tested power electronic equipment, have simple topological structure and are easy to expand; The control method of the vibration starting loop can accurately realize control of each device in the vibration starting loop, and the control process is simple, easy to realize and easy to popularize.