Grid fin locking device

The invention belongs to a grid fin, and particularly discloses a grid fin locking device. The grid fin locking device comprises a fin machine and a grid fin, wherein the fin machine is fixedly arranged on an elastic body, the grid fin can rotate around the fin machine, the grid fin is connected with a fin wing framework of the fin machine, the grid fin rotates relative to the fin wing framework through a fin swing rotating shaft, a torque spring capable of unfolding the grid fin is arranged outside the fin wing rotating shaft, the grid fin is connected with the elastic body through a positioning pin, and the positioning pin is fixedly arranged on the elastic body through installing screws. The device provided by the invention has the advantages that the structure is simple, the realization is easy, and the device is applicable to occasions with a narrow grid fin installing space.