Focusing locking structure of optical instrument

The invention belongs to the technical field of optical instruments, and particularly relates to a focusing locking structure of an optical instrument, which comprises a locking frame, a guide post is fixed in the locking frame, a locking ring is slidably connected between the locking frame and the guide post, a steering groove is formed in the locking ring, and the locking ring is connected with the guide post in a sliding manner. A steering block is slidably connected to the side, close to the guide column, of the steering groove, a transmission rod is fixed to the side, close to the guide column, of the steering block, an extrusion plate is fixed to the end, away from the steering block, of the transmission rod, and the transmission rod is sleeved with a reset spring. The locking ring is pushed to drive the steering block to move, then the extrusion plate is driven to move until the extrusion plate makes contact with the focusing assembly and locks the focusing assembly, the direction of the locking force