An atomization device comprising a sleeving tube, a liquid storage cavity, and a liquid injection structure; wherein: a liquid injection opening is defined in one end of the sleeving tube; at least one air discharging opening is defined in a side wall of the sleeving tube, and both of the liquid injection opening and the air discharging opening communicate with the liquid storage cavity; the liquid injection structure comprises a liquid injection tube, a first sealing member, and a second sealing member; the liquid injection tube runs through the sleeving tube, a liquid inlet is formed in a side wall of the liquid injection tube; the first sealing member is arranged on one end of the liquid injection tube corresponding to the liquid storage cavity; the first sealing member seals the liquid injection opening and separates the liquid inlet from the liquid storage cavity; and the second sealing member is arranged on an outer side of the liquid injection tube and seals the air discharging opening; when the liquid injection tube is pressed into the liquid storage cavity, the liquid injection tube moves from its original place into the liquid storage cavity, the first sealing member moves away from the liquid injection opening, the liquid inlet moves to be inside the liquid injection opening to communicate with the liquid storage cavity, the second sealing member is staggered from the air discharging opening such that the air discharging opening communicates with an external environment; and when the liquid injection tube is released, the liquid injection tube moves outwards to restore to its original position such that the liquid inlet separates from the liquid storage cavity and the second sealing member seals the air discharging opening. a liquid injection opening is defined in one end of the sleeving tube; at least one air discharging opening is defined in a side wall of the sleeving tube, and both of the liquid injection opening and the air discharging opening communicate with the liquid storage cavity; the liquid injection structure comprises a liquid injection tube, a first sealing member, and a second sealing member; the liquid injection tube runs through the sleeving tube, a liquid inlet is formed in a side wall of the liquid injection tube; the first sealing member is arranged on one end of the liquid injection tube corresponding to the liquid storage cavity; the first sealing member seals the liquid injection opening and separates the liquid inlet from the liquid storage cavity; and the second sealing member is arranged on an outer side of the liquid injection tube and seals the air discharging opening; when the liquid injection tube is pressed into the liquid storage cavity, the liquid injection tube moves from its original place into the liquid storage cavity, the first sealing member moves away from the liquid injection opening, the liquid inlet moves to be inside the liquid injection opening to communicate with the liquid storage cavity, the second sealing member is staggered from the air discharging opening such that the air discharging opening communicates with an external environment; and when the liquid injection tube is released, the liquid injection tube moves outwards to restore to its original position such that the liquid inlet separates from the liquid storage cavity and the second sealing member seals the air discharging opening.