Abstract: In order to study the cooling laws of liquid CO₂ on the high temperature loose coal, the cooling laws of three coal samples with the same liquid flow rate were studied by the liquid CO₂ cooling experiment device. The results show that the smaller the particle size, the better the cooling effect. Moreover, the cooling effect of liquid CO₂ on the near and the upper coal body is better than that of the lower coal body, and it is confirmed that there is a certain amount of dry ice under the liquid outlet.