Manually-controlled flexible minimally-invasive surgical instrument with self-locking and quick replacement functions

The invention discloses a manually-controlled flexible minimally-invasive surgical instrument with self-locking and quick replacement functions, and relates to the technical field of minimally-invasive surgical medical equipment for thoracic and abdominal cavities. The instrument solves the problems that existing manually-controlled minimally-invasive surgical instruments are inconvenient to operate and low in flexibility and do not have the self-locking function during rotation and deflection motion, motion coupling exists in end executors through introduction of imitated human wrist joints,and the end executors cannot be quickly replaced. The instrument comprises an end executor, an operating rod, a motion control device and an instrument shell; the end executor comprises a first end small claw quick replacement connector, a second end small claw quick replacement connector, a flexible joint connector, an end small claw rotation shaft, a flexible joint and two end small claws; the motion control device comp