A nebulizing device, comprising: a storage module, comprising: a bottom wall; a tubular sidewall connected to the circumference of the bottom wall, wherein the tubular sidewall and the bottom wall form an accommodating recess having an upper opening to accommodate a liquid, the tubular sidewall comprises an outlet, and the bottom wall is extended to the outlet; and a coupling part connected to an outer surface of the tubular sidewall 12) and aligned with the outlet, and comprising an extension wall and a first recess; a nebulizing unit disposed within the first recess to transform the liquid outputted by the outlet into a plurality of nebulized drops; and a first waterproof gasket disposed within the first recess and located on a side of the nebulizing unit farther from the outlet, comprising: a first opening disposed adjacent to the nebulizing unit; a second opening disposed opposite to the first opening and away from the nebulizing unit; and an annular wall structure connected to the first opening and the second opening of the first waterproof gasket and extended from the first opening toward the second opening, characterized in that the size of the second opening is greater than that of the first opening, and wherein an inner diameter of the annular wall structure is gradually increased from the first opening to the second opening. a storage module, comprising: a bottom wall; a tubular sidewall connected to the circumference of the bottom wall, wherein the tubular sidewall and the bottom wall form an accommodating recess having an upper opening to accommodate a liquid, the tubular sidewall comprises an outlet, and the bottom wall is extended to the outlet; and a coupling part connected to an outer surface of the tubular sidewall 12) and aligned with the outlet, and comprising an extension wall and a first recess; a bottom wall; a tubular sidewall connected to the circumference of the bottom wall, wherein the tubular sidewall and the bottom wall form an accommodating recess having an upper opening to accommodate a liquid, the tubular sidewall comprises an outlet, and the bottom wall is extended to the outlet; and a coupling part connected to an outer surface of the tubular sidewall 12) and aligned with the outlet, and comprising an extension wall and a first recess; a nebulizing unit disposed within the first recess to transform the liquid outputted by the outlet into a plurality of nebulized drops; and a first waterproof gasket disposed within the first recess and located on a side of the nebulizing unit farther from the outlet, comprising: a first opening disposed adjacent to the nebulizing unit; a second opening disposed opposite to the first opening and away from the nebulizing unit; and an annular wall structure connected to the first opening and the second opening of the first waterproof gasket and extended from the first opening toward the second opening, characterized in that the size of the second opening is greater than that of the first opening, and wherein an inner diameter of the annular wall structure is gradually increased from the first opening to the second opening. a first opening disposed adjacent to the nebulizing unit; a second opening disposed opposite to the first opening and away from the nebulizing unit; and an annular wall structure connected to the first opening and the second opening of the first waterproof gasket and extended from the first opening toward the second opening, characterized in that the size of the second opening is greater than that of the first opening, and wherein an inner diameter of the annular wall structure is gradually increased from the first opening to the second opening.