In order to solve the problem of subjective analysis and single index in the fire risk assessment of mining belt, this paper proposes a comprehensive evaluation method of fire risk of mining belt based on entropy weight method and grey correlation degree method. By using NBS smoke density test box and cone calorimeter, the key influencing factors of fire risk such as light transmittance, heat release rate, smoke generation rate and CO generation rate of mine belt fire smoke were analyzed, and a multi-level evaluation index system of mine belt fire risk was established. The fire risk of mine belt under different thermal radiation conditions was comprehensively evaluated. The results show that under the thermal radiation intensity of 50 kW/m2, the light transmittance of mine belt decreases rapidly, and decreases to 0 at 70 s. Compared with the heat radiation intensity of 25 kW/m2, the peak heat release rate and total heat release at 35 kW/m2 increased by 29.06% and 36.22%, respectively, the peak smoke production rate and total smoke production increased by 45.55% and 31.54%, respectively, and the time to reach the peak smoke production rate was shortened by 92.59%. The weight ranking of fire risk factors of mine belt is : combustion risk ( 0.5216 ) > smoke risk ( 0.2522 ) > toxic gas risk ( 0.2261 ). The research results can provide basic support for the formulation of mine belt fire escape route.