Abstract The high temperature environment in the deep part of the mine has a serious impact on personnel health and safety in production. The thermal comfort of human body is an important index to evaluate the working environment of mine. In this paper, several stopes of Xiadian gold mine in China are taken as that research object, the thermal comfort equation of human body is established, and the thermal environment parameter of − 652 m level 55,102 stope, − 692 m level 55,001 stope and − 700 m level 55,203 stope are evaluated according to the HSI and the PMV-PPD index, and the thermal comfort parameters of work environment are obtained. The heat storage rates of the three stopes are 77.15 W/m2, 81.05 W/m2 and 85.73 W/m2 respectively, the HSI are 246.62, 257.88 and 270.84 respectively, and the PMV-PPD values are 2.75, 97.31%; 2.89, 98.52%; 3.10, 99.47% respectively. The evaluation index shows that the heat dissipation of the working body cannot reach the balance state under the environment, the heat will be accumulated in the human body, and the environment will harm the health of the operators.