An external fixation locking device comprises a bolt (1), a spring (2), a spherical washer (3), a top piece (4), a middle piece (5) and a tube locking bottom piece (6), wherein the top piece (4) is a tube locking top piece (41) or a pin locking top piece (42), wherein the spring (2), the spherical washer (3), the top piece (4), the middle piece (5) and the tube locking bottom piece (6) are successively threaded onto the screw rod of the bolt (1), wherein the axes of the spring (2), the spherical washer (3), the top piece (4), the middle piece (5) and the bottom piece (6) coincide with the axis of the bolt (1).
