The utility model discloses a welding fume processing device, which comprises arc light sensors, a fume air inlet, a driving device and a fume pipeline. The fume air inlet is connected with the fume pipeline; a plurality of the arc light sensors are arranged on the edge of the fume air inlet; and the arc light sensors are connected with the driving device through lines. Deviation signals are produced according to whether each arc light sensor is welded with an air inlet of a fume catch device and real-time welding point deviation condition. After the deviation signals are processed by amplification, filtering and shaping, the air inlet is judged whether or not to deviate from welding beads. Attitudes of the air inlet is adjusted by a welding fume welding bead tracking and driving device to reach the purpose of tracking welding positions in real-time manner. The welding fume processing device has small investment and low use cost, lowers labor intensity and increases working efficiency.