The present invention provides an apparatus and method for a space sterilization service, the apparatus comprising an air tank for storing high-pressure air, and a sterilizing solution tank for storing a sterilizing solution, wherein: the need for a separate compressor is eliminated to simplify the configuration and facilitate operation; a gas heater or a phase change material is used as an energy source required for vaporizing the sterilizing solution, thereby significantly reducing the electric energy consumption; and an angle-adjustable fan is provided to be applied to the diffusion and decomposition of the sterilizing solution so as to eliminate the need for a sanitation worker to install the fan, thereby shortening the working time and significantly enhancing worker safety.
