Extension platform locking mechanism

The utility model discloses an extension platform locking mechanism which comprises a movable platform (13), a grip (1), a connecting rod (2) and a fixed seat (3), a support is arranged above the movable platform (13), the bottom of the movable platform (13) is connected with a fixed platform (12) in a sliding mode, the grip (1) is connected with the top of the support in a rotating mode, a connecting rod (1.1) is fixed on the grip (1), the connecting rod (2) is hinged to the connecting rod (1.1), and the fixed seat (3) is hinged to the connecting rod (2). A guide sleeve (4) is fixed on the movable platform (13), the fixed seat (3) is in sliding connection with the guide sleeve (4), a first limiting structure used for locking the movable platform (13) is fixed on the fixed seat (3), and a second limiting structure matched with the first limiting structure is arranged on the fixed platform (12). The extending platform locking mechanism has the advantages of being simple in structure, stable in locking, easy an