The invention provides a locking mechanism. The locking mechanism can meet the requirements of repair, replacement and the like of aerospace products when in orbit, the operation is simple, the connection is reliable, and is suitable for places where the aerospace product needs to be fastened and connected when the aerospace products in orbit; the locking mechanism consists of a sleeve assembly and an insertion shaft assembly, wherein the sleeve assembly can be used for carrying out omni-directional surrounding type locking on the insertion shaft assembly, a locking mode is safe and reliable,and omni-directional micro floating and adjusting can be realized; the sleeve assembly and the insertion shaft assembly can be correspondingly fixed on two objects, when a safety cover is connected with the object A and a base is connected with the object B, rapid and reliable connection of the object A and the object B can be achieved, and omni-directional micro floating and adjusting can be realized; and by means of the locking mechanism, the rapid and reliable connection and locking of two objects can be realized, and the locking mechanism has the characteristics of being small in size, simple in operation, high in reliability and the like.