Taking C8051F020 microcontroller as the control core, a pressure controller used in battery pole piece continuous rolling production line was design. Hardware design in rolling pressure control system of battery pole piece was introduced, and the fuzzy PID algorithm was applied in software program design. The test result shows that it can replace the PLC control, production needs can be completed, and cost is reduced, the quality of the pole piece is improved. It meets the needs of actual production.