Post-earthquake fire simulation technology based on BIM was discussed to quantitatively evaluate the impact of fire door damage on the fire temperature distribution. Three seismic waves consistent with the site type and its seismic design group were selected to analyze the nonlinear structure of the 9-story Benchmark steel structure model，and the inter-story displacement angle was used as the evaluation index of the non-structural component door damage，combined with the door vulnerability curve of FEMA P-58 to establish the door damage model. Then，using the fire door damage model obtained by BIM，the information model of the fire was quickly and accurately established. The Pyrosim was imported to simulate and analyze its impact on the fire temperature distribution，and the real temperature field distribution based on the correlation between the burning substance and the fire location was obtained. The results show that the increase in the number of door damages directly affects the temperature of the frame columns，and the larger the number，the higher the temperature of the frame columns; except for the fire and unburned fire compartments，the temperature of frame columns in other fire compartments with regard to door damage is significantly higher than that without considering door damage，with a maximum of 483.98 ℃. When the fire is located at different layers，the number of frame columns that reach the temperature boundary value of each layer is different.