Abstract: In order to improve the prevention and control of mine external fire and explore the pyrolysis characteristics and fire risk of coal mine conveyor belt during heating process,the PVC flame retardant conveyor belt of a coal mine was selected as the research object. Thermogravimetric analyzer and cone calorimeter were used to investigate the pyrolysis behavior of conveyor belt. The results show that the heating rate and thermal radiation intensity play an important role in the pyrolysis and combustion of conveyor belt. The pyrolysis and combustion of conveyor belt has two stages. The first stage（158 ～415 ℃） pyrolysis is mainly due to the heating and melting of conveyor belt,surface deformation and cross-linking polycondensation reaction. In the second stage（ 415～757 ℃）,the conveyor belt began to burn violently,and the fire risk increased with the increase of thermal radiation intensity. The Friedman method and the KAS method of two equal conversion rate methods were chosen to solve the kinetic parameters of the two stages of the reaction of the conveyor belt pyrolytic combustion,and the activation energies were calculated to be 62. 239kJ/mol and 38. 850kJ/mol,respectively. The conveyor belt reaches its maximum fire hazard at a heat radiation intensity of 45 kW/m².