This paper discusses the improvement research of the PLC-based control system for a fiber coloring ma-chine,aiming to improve the speed of fiber coloring and solve the difficulties in tension control of high-speed winding and the unevenness of the winding process.By improving the process algorithm and implementing the program,the perfor-mance and production efficiency of the fiber coloring machine are effectively improved,and the feasibility of the improve-ment plan is verified through experiments.