The invention provides a testing method of a 1000kV extra high tension series-compensated protection exit loop. The testing method includes the steps: connecting a signal source, detecting the valuesof voltage and current, comparing the comparison result with the stored data to determine whether a fault occurs, marking the place where an alarm is given, unlocking through keywords and making remarks, and ensuring accuracy of the record. The testing method of a 1000kV extra high tension series-compensated protection exit loop can preferably uses the corresponding device to obtain the best testresult so as to protect one primary equipment, with high efficiency, and does not need a universal meter to measure on/off repeatedly, thus reducing the labor, saving the time, and avoiding the phenomenon of forgetting and loss by setting fluorescent paint on the outer wall.