The work aims to study the influence of different sealing conditions of aluminum foil on the surface temperature distribution of aluminum foil during electromagnetic heating, and establish the theoretical basis of non-contact sealing detection. Firstly, a finite element mathematical model of the induction heating theory was created to calculate the Joule heat generated by the induced current to solve the temperature field for the internal heat source. Then, steady-state heat conduction model of aluminum foil seals with six different sealing ways was created by the finite element method. The three-dimensional analysis of the temperature distribution of different aluminum foil seals at constant temperatures was carried out. Simulation and analysis of heat transfer characteristics of aluminum foil seals in heating temperature field were conducted with Ansys software. The temperature field image and temperature curve corresponding to various sealing conditions were obtained. The temperature field image sealed by aluminum foil was a closed and uniform annular region with high temperature; in its temperature curve, the temperature was concentrated at 70~80 °C and featured by symmetry, and there are 2 high temperature peaks. The other 5 were unlooped or uneven thermal images, indicating that the aluminum foil sealing failed. According to the distribution characteristics of the thermal temperature field, the sealability of the aluminum foil seal can be evaluated, and it can provide theoretical support for further optimizing the automation degree of the non-contact sealing detection.