To address the challenge of the unclear spatiotemporal coupling mechanism of the wind temperature field in dynamic excavation roadways during the thermal hazard control of deep high-temperature mines, a three-dimensional unsteady heat transfer model of the dynamic excavation process was constructed. A dimensionless time F_ov characterizing the excavation speed and the traditional dimensionless distance X were introduced to establish a spatiotemporal binary relationship Θ(F_ov, X) for the temperature field. The spatiotemporal coupling relationship of the dimensionless temperature in the excavation roadway was obtained through iterative inversion based on the Gauss-Newton method, further revealing the nonlinear mechanism of the effect of inlet air temperature on thermal hazard regulation. The results show that the evolution of the dimensionless temperature over time and space follows an exponential-quadratic time-varying relationship (Mean Relative Error MRE=1.1%). The temperature gradient is positively correlated with distance and negatively correlated with time. The initial cooling effect of low-temperature air supply is significant, but after long-term ventilation, the air flow and surrounding rock gradually approach thermal equilibrium, and the cooling efficiency attenuates by 26.3%. Thermal hazard control projects should integrate surrounding rock thermal management with localized cooling to improve cooling sustainability. A reduction in the inlet air temperature intensifies the nonlinear variation characteristics of the air temperature, increasing the MRE of the dimensionless temperature spatiotemporal coupling model from 1.10% (30 ℃) to 1.81% (20 ℃), while still meeting engineering accuracy requirements. The air temperature response in the area near the heading face is the most sensitive. When the inlet air temperature rises from 20 ℃ to 30 ℃, the total temperature rise near the heading face area is 42.1% higher than that in the roadway exit area. Taking a heading face air temperature threshold of 26 ℃ as the constraint, a dynamically designed inlet air temperature that meets the cooling requirements was derived.