The present invention relates to an aroma diffuser with an adjustable essential oil gas proportion and an aroma diffusing method. The aroma diffuser includes a housing, an electric control element, at least two essential oil bottles, gasification elements corresponding to the essential oil bottles, pump elements corresponding to the gasification elements and a fragrance mixing element. The lower end of each of the gasification elements is connected to an open end of the corresponding essential oil bottle. Each of the gasification elements communicates with the open end of the corresponding essential oil bottle. An upper end of each of the gasification elements stretches into a cavity at the lower end of the fragrance mixing element and fits with the end face of the cavity. The present invention features a compact structure, high sealing performance, easy assembly and simple operation.
