The invention discloses a small full-automatic pipe connector tapping machine operation method, and belongs to the technical field of machining facilities. A tapping program is set in a control box, aworker places a to-be-tapped pipe connector to the center of an electromagnetic clamp, a tapping servo motor and a lifting servo motor work at the same time, the tapping servo motor drives a screw tap to rotate, the lifting servo motor drives a telescopic pipe and a telescopic shaft to descend, and after the screw tap taps an inner thread in the pipe connector, the tapping servo motor and the lifting servo motor reversely rotate at the same time to return to the original position.