Abstract: A kind of duplex working positioned magnetic particle testing machine for miniature rod-shaped parts was introduced, where composite magnetization method was used. Circumferential magnetization was completed by the alternating current, while longitudinal magnetization was completed by the rectified alternating current in two magnetizing coils. The characters of its mechanical structure and magnetization current regulation circuitry were described in detail. Magnetization method should be selected among composite magnetization, circumferential magnetization and longitudinal magnetization according to the demands. Magnetization current could be regulated conveniently by the potentiometers in the control panel. Experiments had proved that the inspection of rod-shaped parts by the machine was efficient, meanwhile, the inspection met the requirements of magnetic particle testing and guaranteed the reliability.