Temperature is a key factor affecting the CO₂ injection efficiency and CH₄ production efficiency, so it is of great significance to clarify the evolution diagram of temperature change during the CO₂-ECBM process. In this study, the crushed soft coal seam with low permeability in Huainan coalfield was taken as the research object. Firstly, the fully coupled mathematical models of CO₂-ECBM process were constructed, and the influence of temperature field on CO₂-ECBM process was emphasized. Secondly, the evolution law of CO₂-ECBM process at different time was revealed. Then, the effects of injection temperature and initial temperature on the CO₂-ECBM process were analyzed. Finally, the evolution mechanism of reservoir temperature during the CO₂-ECBM process was illustrated, and the effect of temperature on temperature field of CO₂-ECBM process was further illustrated. The results show that the longer the displacement time, the CH₄ concentration gradually decreased, and the CO₂ concentration gradually increased. The area where the temperature changes are more concentrated focuses on the vicinity of CO₂ injection well, which are mainly determined by the dominant reaction of adsorption and desorption reactions of binary gas. Reservoir temperature and permeability are positively and negatively correlated with injection temperature, respectively. Both CO₂ storage capacity and CH₄ production capacity increase with the increase of injection temperature, and the sensitivity of CO₂ storage capacity to temperature was greater than that of CH₄ production capacity. With the increase of displacement time and injection volume, the effective displacement radius increases, but the increment of influencing radius gradually decreases. The lower the initial temperature of coal reservoir, the larger the influencing radius, and which increases with the increase of displacement time. CO₂ storage capacity and CH₄ production capacity decrease with the increase of initial temperature. Young's modulus and Poisson's ratio can effectively change the reservoir strength. CO₂ storage capacity and CH₄ production capacity decrease with the increase of Young's modulus, and increase with the increase of Poisson's ratio. This study can support the engineering landing of CO₂-ECBM technology in crushed soft coal seam with low permeability, and promote the realization of China's “Dual Carbon” strategic goal.