Digital controller control method of beam line magnet power supply

The invention discloses a digital controller control method of a beam line magnet power supply. The method comprises the following steps: setting a plurality of sets of magnet power supply control parameters according to different energy requirements of proton therapy; the multiple sets of magnet power supply control parameters comprise multiple sets of current parameter values, PID (Proportion Integration Differentiation) adjustment parameter values, current and voltage feed-forward parameter values and magnetic field response standard values; setting a plurality of magnet power supplies and the current treatment head to be in the same communication domain; the digital control units of all magnet power supplies in the same domain receive the DDS instruction at the same time and obtain beam energy values; the digital control unit of each magnet power supply looks up a table according to the current beam energy value to obtain related current parameters and obtains related magnet power supply control parameter