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Belt is the key transmission component of combine, which will lead to rubber aging, surface hardening and wear cracking due to temperature rise in the process of high strength operation. Focused on calculation of temperature field of belt, a prediction method of steady-state temperature field of transmission belt based on dynamic model and finite element simulation was proposed. Firstly, calculation model of temperature rise and heat source of transmission belt was established by setting physical parameters of the pulley, dynamic characteristic parameters of belt, friction and torsion parameters of tension mechanism, driving and load parameters in AVL Excite TD software. Secondly, finite element prediction model of two-dimensional steady-state temperature field was established by analyzing heat balance equation of belt, calculating heat flow distribution coefficient and heat transfer coefficient. Thirdly, belt working condition acquisition system was developed based on CAN bus of combine. Finally, steady temperature field of a certain V-belts of wheat harvester was studied. The experiment results showed that measured steady-state temperature was 42.55℃ and simulated steady-state temperature was 41.7℃ under the working conditions of average speed of driving wheel of 2244r/min and average load of driven wheel of 338N·m. The steady-state error was 1.97%. Measured steady-state temperature was 45.95℃ and simulated steady-state temperature was 45.2℃ under the working conditions of average speed of driving wheel of 2244r/min and average load of driven wheel of 382N·m. The steady-state error was 1.97%. Steady-state error of the two tests was less than 2%, which verified the feasibility and accuracy of the prediction method for the steady-state temperature field of the combine drive belt.