An angle-adjustable aroma diffuser is provided, including a hollow housing, a heat-transfer container, a heating component and an angle-adjustable electric plug. The hollow housing has a first opening and a second opening. The heat-transfer container is mounted in the hollow housing. The heating component is combined with a bottom side of the heat-transfer container. The angle-adjustable electric plug is combined with the second opening of the hollow housing. The angle-adjustable electric plug is electrically connected to the heating component. Therefore, an aroma capsule can be disposed in the heat-transfer container through the open end, the hollow housing and the heat-transfer container of the angle-adjustable aroma diffuser can rotate upward and modulate an angle, and the aroma capsule generates fragrance upward through the open end of the heat-transfer container.
