The present invention relates to a multifunctional spontaneous combustion inhibitor for bituminous coal in the form of a foam concentrate, which may inhibit the spontaneous combustion of bituminous coal, prevent the scattering of bituminous coal, prevent the occurrence of problems due to spontaneous combustion, such as a power plant operation failure, bituminous coal waste, and odor generation, enables a bituminous coal power plant to be operated economically, safely and environmentally friendlily through the use of inexpensive bituminous coal, and may be used even at −20° C. by improving the pour point thereof. The present invention is characterized in that a spontaneous combustion inhibitor is prepared in the form of a water-soluble foam concentrate by using an antioxidant, a volatile fraction activation inhibitor, and an emulsifier compound, is mixed with water and air, and is distributed and applied to bituminous coal in a foamed state.