Abstract: The power supply of the accelerator magnet is controlled by the central control room. The power supply can be opened and closed through remote digital and analog interface. The development of the remote control device was designed to check and repair the power supply. It can control the power supply locally and provide helps for reparations of power supply. The device includes single-chip microcomputer (SCM), matrix keyboard, man-machine interface, and high precision A/D and D/A chips. Experiments show that the device can set the power supply accurately and meet the design requirements. It provides a powerful condition for the problem of finding the power supply.