The finite element analysis of the temperature field of the 1M emery roller of the Bühler MDDK1000/250 roller mill was carried out. The results showed that the temperature difference between the inside and the outside of the roller gradually decreased from the start of the work of the roller mill to 80 ℃ or so. In the steady state, the roll surface temperature change tended to be fast at first and then slow down. However, the heat flux of the entire roll body showed a tendency of rising at first and then falling and then stabilizing. As the roll surface temperature gradually reached steady state, the overall temperature field of the roller mill remained basically stable. The research conclusions provide theoretical basis for the designer of roller mill and provide reference for peers.