Micro-motion locking screw

The invention relates to a micro-motion locking screw which comprises a screw body made of a non-biodegradable material; the screw body is fixedly provided with a screw sleeve made of a degradable material; the screw body is composed of a locking thread, a connection rod, a screw bone thread, screw returning self tapping slots and screw feeding self-tapping slots which are sequentially connected; the screw sleeve is provided with the screw bone thread. According to the micro-motion locking screw, pressurizing operation can be conducted in surgery, the screw sleeve can be degraded within 1-15 months, a bone close to the side of a locking bone connection plate can conduct micro motion after the screw sleeve is degraded, and thus growth of the bone is promoted under stimulus of force.