Abstract: For the current problems of inefficient artificial grading by color in bamboo processing industry, an automatic control system for grading pipeline of dyeing bamboo sticks was proposed. The system, which is based on a single chip microcomputer(SCM) system, includes shooting position sensors, grading position sensors, grading electromagnets and serial port circuit. Information of grading level and the passing order of bamboo sticks were stored in doubly linked list data structure by control algorithm. At the same time the grading position sensor pointer array records the trigger information of grading position sensors and the action of electromagnets was determined by electromagnet stack. Verified by the experiments, the results showed that the accuracy of grading bamboo sticks into eight levels was 100%, which indicated that the system was an effective solution to dyeing bamboo sticks grading.