The invention relates to a generator protection and operation breaker integrated device for a test station and a control method thereof. The integrated device is arranged between the outlet end of a generator and a closing switch and comprises a tightly coupled split reactor (2), a protection breaker (6) and an operation breaker (8). The tightly coupled split reactor (2) is connected in parallel with the two phases of the protection breaker (6), the protection breaker (6) is connected in series with the operation breaker (8), and the operation breaker (8) is connected with an external circuit. The device adopts the tightly coupled split reactor connected in parallel to realize the current sharing and the current limiting of the switch branch, which effectively solves the problems of insufficient breaking capacity of the generator protection breaker of the high power test station and difficult selection of the operation breaker, and adopts the specific control sequence to improve the fault current breaking capacity and the motion reliability of the integrated device at the same time.