Offshore wind power double-bus system transformer back-switching loop closing system

The utility model relates to an offshore wind power double-bus system transformer back-switching loop closing system, which comprises a first bus assembly, a second bus assembly, a bus tie switch and a loop closing branch, the first bus assembly comprises a first main transformer, the second bus assembly comprises a second main transformer, one end of the loop closing branch is connected with the first main transformer, and the other end of the loop closing branch is connected with the second main transformer. The bus tie switch is arranged on the loop closing branch; the device further comprises a first flexible device and a second flexible device. The first flexible device and the second flexible device are each provided with a back-cut impact restraining branch and a passage branch, and the passage branches and the back-cut impact restraining branches are connected in parallel. The back-switching impact suppression branch circuits are respectively connected between the bus tie switch and the first main tra