Automatic bottle single head screw capping machine adopts inverter control, mechanical drive applications cam principle, circle disc splitter positioning, and the implementation of the circular screw cap capping. Load cover and capping are automatic. Capping sheet structure with a magnetic composition, not to hurt the caps. The screw capping head is easy to disassemble, different cover and bottle just replace parts. It is a multi-purpose machine. Can be integrated with filling machine, labeling machine to compose a production line.