Automatic tracking method and automatic tracking apparatus based on welding seam

The invention relates to an automatic tracking method and automatic tracking apparatus based on a welding seam. The automatic tracking apparatus includes an image acquisition device, a master control board, and a travelling device, the image acquisition device acquires and transmits an acquired image including a preset mark image; the main control board is used for receiving and acquiring the distance difference between the center point of the preset mark image position and the center point of the image pixel position according to the acquired image; based on the distance difference, an adjustment instruction for adjusting the position of the image acquisition device is transmitted; and the travelling device is used for receiving and adjusting the position of the image acquisition device according to the adjustment instruction to make the image acquisition device travel along the welding seam and acquire the acquired image. The automatic tracking method and automatic tracking apparatus based on the welding se