Abstract: In order to early diagnose and identify the roller stuck fault from the aspect of temperature characteristics, this paper firstly uses the combination of belt conveyor fire simulation system experiment and COMSOL numerical simulation to study the influence of conveyor belt speed, roadway wind speed and ambient temperature on the roller temperature. The results show that when the ambient temperature increases or the conveyor belt speed increases, the overall temperature of the roller increases, and the time required for the roller temperature to reach a steady state is prolonged. When the wind speed of the roadway increases, the overall temperature of the roller decreases, and the time required for the roller temperature to reach a steady state decreases. Considering that the conveyor belt wears through and jams the idler, which leads to the ignition of the pulverized coal accumulated inside the idler and causes the conveyor belt fire, this paper further studies the influence of conveyor belt speed, roadway wind speed, ambient temperature and the amount of coal accumulated in the idler on the maximum temperature of pulverized coal in the idler. The results show that the influence of conveyor belt speed, roadway wind speed and ambient temperature on the maximum temperature of pulverized coal is consistent with that on the overall temperature of coal-free roller. The more the amount of coal accumulated in the roller, the greater the variation of the maximum temperature of the pulverized coal, and the greater the risk of ignition.