Abstract: By taking 7075-T6 aluminum alloy as the welding material, the heat generation model of friction plug welding was established on the basis of the law of Coulomb friction. The friction plug welding process of 7075-T6 aluminum alloy was simulated by ABAQUS software, and the finite element model of temperature field of the welding area was established. The temperature field of the friction plug welding area was simulated by two heat source loading models including the fixed heat flux and the heat flux based on the test data, respectively, and the simulation results were verified by the experimental results. The results show that the change trends of the temperature field of the welding area using the two heat source loading models were consistent, but the temperature of the welded aluminum plate obtained by the heat source loading model of using the fixed heat flux was higher at the same time. The temperature change trends of the temperature measurement point of the welded aluminum plate by two heat source loading models both agreed with the test results, but the simulation results obtained by using the heat flux based on the test data were more accurate. Therefore, it was feasible to simulate the temperature field of the friction plug welding area of 7075-T6 aluminum alloy by the finite element heat generation model.