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In the processing and winding process of corn directional belt making, tension control determines the quality of corn directional belt. A corn seed directional belt making machine was developed and transfer functions of constant tension winding system were set up. The fuzzy PID self-adaptive control technology was used to achieve constant tension winding in corn directional belt making and a fuzzy PID self-adaptive controller was created. Finally, the software Matlab was used to simulate. As a result, reasonable fuzzy PID self-adaptive control algorithm was obtained, and fuzzy PID self-adaptive control algorithm was used in the actual tension control by using Siemens S7-200 PLC core hardware control circuit, as well as the winding experiment was carried out. Test results showed that the fuzzy PID self-adaptive had better dynamic stability and tracking performance compared to the conventional PID controller and the controller could meet the requirements of corn directional belt winding. When the tension generated step, system transition time was about 2s and overshoot was in 1.2%.