The working process of combine harvester was analyzed, aiming at the properties of nonlinear, time varying and delay. Fuzzy control with grey prediction algorithm was used to control the speed of combine harvester and keep the load stable. The necessity and importance of the combining predictive control with fuzzy control was analyzed. Forward speed control device for combine harvester based on grey prediction fuzzy control was designed. The grey prediction fuzzy control model was established, simulated and tested. The results showed that the control system with the grey prediction fuzzy control algorithm had shorter adjustment time, smaller overshoot and more superior control performance. 