In this paper, we propose a high-robustness, temperature-pressure integrated flexible sensor based on heat conduction and analyze its underlying mechanism. A three-dimensional model was established using COMSOL, and the temperature field in the structure was calculated. The results show that the input pressure is inversely proportional to the output voltage of the proposed sensor. The sensitivity is -0.205 mV/kPa in the range of 0-500 kPa with a nonlinearity of 6.161%. Likewise, the sensitivity is -4.937 mV/kPa in the range of 525-740 kPa with a nonlinearity of 9.628%. We describe the underlying mechanism of the sensor, providing a theoretical foundation for optimizing its parameters and structure.