Wind turbine gear is an essential part of a wind turbine, and the induction hardening is an important treatment method for its surface strengthening. However, when scanning induction heating, the end position is the weak part of the process. In this paper, the dynamic evolution process of the end temperature field was studied during the scanning induction heating of wind turbine gear. It was found that a significant hysteresis emerge in the temperature field of the lateral tooth profile before the scanning heating reaches the steady state stage. The reason lies in the poor heat transfer caused by the gear end structure, and the combined effect of induced eddy current heating in the region. The hysteresis distance of the temperature field at the end, is positively correlated with the inductor scanning speed within a certain range. The material parameters of gear are affected by the change of temperature, which in turn affects the heating process. The induced magnetic field on the two tooth flanks has an obvious forward movement phenomenon under the combined action of the gear temperature and the magnetic flux concentrator. The steady-state temperature field forms a loop on both flanks. Increasing the movement speed within a certain range, a gap would appear at the lower boundary of the ring. The evolution process of the end temperature of the gear scanning induction heating is clarified in this paper, which would provide a research foundation for improving the end heating quality and precise control.