The invention relates to a locking-unlocking device driven by two-stage redundancy, belonging to the technical field of locking and unlocking between two structures. The device is characterized by comprising a cylindrical shell with two open ends, a shell base, a shell top cover, a split nut, a ferrule 11, a primary drive, a primary stop dog, a switching device and a secondary drive, wherein the shell base and the shell top cover are respectively connected with the two ends of the shell, and through holes are respectively arranged in the centers of the shell base and the shell top cover; the split nut is arranged on the inner axial line of the shell, the ferrule is sleeved at the periphery of the split nut, and one end of the collar is closed; and the primary drive, the primary stopdog, the switching device and the secondary drive are arranged in the shell. The device has the advantages of reliable locking and unlocking, little unlocking impact force, strong bearing capacity, fast resetting operation, compact structure, small volume, diversified installation interfaces, and the like.