This product utilizes the film-forming mechanism based on the foam slow-release theory to inhibit coal during the processes of moisture evaporation, gas desorption, oxygen absorption and weight increase, and thermal decomposition. The capsule material exhibits film-forming properties at high temperatures, enabling the wall material to effectively coat the core material and rapidly release the core material substances as the temperature increases. By adding compound inhibitors of different concentrations, the inhibitory foam with the best foam performance is selected for use with the inhibitor. The obtained foam has a large foaming volume, a tight polygonal structure, and a long half-life of foam volume. Using high-piled foam as a carrier to transport polymer inhibitors to the surface and gaps of high-level residual coal, it achieves triple inhibitory effects: foam protection, liquid film protection, and surface inhibitory protection.