In view of the low automation degree of bamboo fixed-length truncation equipment, this paper proposes a bamboo truncation control scheme based on software motion control, and uses image processing technology to integrate and design the bamboo joint identification system, which can effectively avoid opening and cutting bamboo joints during processing. Firstly, the smoothed image is obtained by grayscale processing, filtering and denoising; secondly, vertical line features are extracted by morphological operations such as opening operation and dilation; finally, by optimizing and screening the line segments obtained by the line edge detection, it is calculated and judged whether there is a bamboo joint in the pre-truncated area. The experimental results show that the accuracy rate of bamboo joint recognition of the system can reach 90%, and the recognition efficiency is high, which can meet the needs of fixed-length production of bamboo.