The invention discloses an automatic adjustment device and method for height of a fiber fusion discharging electrode and belongs to the field of fiber fusion machines. The device disclosed by the invention comprises left and right symmetrical units capable of adjusting the height of the electrode, and is characterized by further comprising distance sensors, A/D (Analogue/Digital) converters, a CPU(Central Processing Unit), stepping motors and cams, wherein the distance sensors, the A/D converters and the CPU are connected in sequence through a line; the CPU is connected with the stepping motors through a line; the stepping motors are in transmission connection with the cams; the cams can be in contact connection with the left and right symmetrical units capable of adjusting the height ofthe electrode; the electrode is fixed on the left and right symmetrical units capable of adjusting the height of the electrode. By adopting the automatic adjustment device and method disclosed by theinvention, the control precision can reach 1.6mu m and the adjusting speed is rapid; the adjustment can be finished in one step through the stepping motors and too complicated calculation is not needed.