A portable movable discharge processing system by short electric arc, comprising a power supply cooling water tank (1), a short electric arc cutting power supply (2), a ring current device (16), a feeding mechanism (17), a hanging bracket and a pneumatic ring current tool (35) mounted on the hanging bracket, which are successively and cooperatively mounted on a horizontal plane; an air compressor (22) and a sewage pump (26), which are successively connected to the feeding mechanism; a self-priming pump (3) and a movable short-electric arc cutting device control cabinet (4), which are successively connected to the air compressor; an anode device (15) which is connected to the movable short-electric arc cutting device control cabinet (4) through an anode cable (6); a cathode device which is connected to the movable short-electric arc cutting device control cabinet (4) through a cathode cable (5); and a water pump which is connected to the anode device through a pipeline. The discharge processing system is convenient to use, low in labor intensity and good in safety.