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Based on the thermodynamics and dynamics analysis of polymer composite gear meshing transmission process, the coupling thermal-mechanical model is established, the changing rule of the gear body temperature rise and the transient temperature of friction interface is studied. The main factors influencing the temperature field distribution of molecular composite gear during gear meshing transmission are analyzed by using the finite element software LS-PrePost. The body temperature rise and instantaneous temperature rise are measured in real time by infrared thermograph. The results show that the greater the friction coefficient, the more significant the temperature rise of the body. With the increase of external <italic>G</italic>, the instantaneous temperature rise of the contact interface increases, and the theoretical calculation value is basically consistent with the measured value.