Orthopaedic instrument capable of changing size of drill and automatically cleaning drill

The invention relates to the technical field of orthopedic instruments, and discloses an orthopaedic instrument capable of changing the size of a drill and automatically cleaning the drill. The instrument includes a shell, the inner wall of the shell is slidably connected to a push plate, the bottom of the push plate is movably connected to a connecting rod, a cleaning plate is movably connected to the bottom of the connecting rod, a water inlet pipe is inserted into the outer side of the shell, a swing door is movably connected to the bottom of the shell, a filter plate is movably connected to the inner bottom of the shell, a swing rod is movably connected to the front face of the filter plate, and a buffer spring is fixedly connected to the top of the swing rod. According to the orthopedics instrument capable of changing the size of the drill and automatically cleaning the drill, by rotating an adjusting drill, when the adjusting drill rotates to the bottom, a pressing rod is pressedto descend, the pressing