DC reversible magnetizing power supply is a DC reversible power supply specially designed for the magnetizing and demagnetizing coils of magnetic material pressing machines. As a DC power supply, it adopts the anti-parallel output of two sets of three-phase bridge rectification positive and negative poles at the secondary side of the load-matching transformer and realizes the positively and negatively reversible direct current by the phase shift trigging way of a digital three-phase control panel. The power supply adopts constant-current closed-loop control, after the current values of the maximum positive current, maximum negative current and minimum positive current are preset, it controls the power-on time of the maximum positive current, maximum negative current and minimum positive current through the extrocontrol passive switch signal, it adopts inverting quick shut-off mode during the positive and negative switching of the power supply.