An atomizer (100, 200, 300), comprising an atomization assembly (130, 230, 330), a liquid storage cavity (141, 211, 311) fluidly connected to the atomization assembly (130, 230, 330), and an air flow passage communicated with the atomization assembly (130, 230, 330); wherein, the atomizer (100, 200, 300) further comprises an air-liquid equilibrium element (150, 250, 350) and an air inlet (1430,213, 3211) communicated with the air-liquid equilibrium element (150, 250, 350); wherein, the air-liquid equilibrium element (150, 250, 350) is configured to supply air to the liquid storage cavity (141, 211, 311) and store liquid, and the air-liquid equilibrium element (150, 250, 350) comprises liquid storage grooves (1510, 1520, 2522, 3522, 440) with capillary force function and an air backflow groove (153, 2523, 3523, 420); the air backflow groove (153, 2523, 3523, 420) has one end communicated with the liquid storage cavity (141, 211, 311), and another end communicated with the air inlet (1430, 213, 3211), the air backflow groove (153, 2523, 3523, 420) is communicated with the liquid storage grooves (1510, 1520, 2522, 3522, 440) such that the liquid storage grooves (1510, 1520, 2522, 3522, 440) are communicated with the liquid storage cavity (141, 211, 311), and characterised in that the air-liquid equilibrium element (150, 250, 350) comprises a surface tension isolation groove (154, 2524, 3524), the surface tension isolation groove (154, 2524, 3524) is configured to isolate tension for liquid in the liquid storage grooves (1510, 1520, 2522, 3522, 440), the air backflow groove (153, 2523, 3523, 420) and the surface tension isolation groove (154, 2524, 3524) are respectively disposed at two opposite sides of the air-liquid equilibrium element (150, 250, 350), and the air backflow groove (153, 2523, 3523, 420) is communicated with the air inlet (1430, 213, 3211) through the surface tension isolation groove (154, 2524, 3524). wherein, the air-liquid equilibrium element (150, 250, 350) is configured to supply air to the liquid storage cavity (141, 211, 311) and store liquid, and the air-liquid equilibrium element (150, 250, 350) comprises liquid storage grooves (1510, 1520, 2522, 3522, 440) with capillary force function and an air backflow groove (153, 2523, 3523, 420); the air backflow groove (153, 2523, 3523, 420) has one end communicated with the liquid storage cavity (141, 211, 311), and another end communicated with the air inlet (1430, 213, 3211), the air backflow groove (153, 2523, 3523, 420) is communicated with the liquid storage grooves (1510, 1520, 2522, 3522, 440) such that the liquid storage grooves (1510, 1520, 2522, 3522, 440) are communicated with the liquid storage cavity (141, 211, 311), and characterised in that the air-liquid equilibrium element (150, 250, 350) comprises a surface tension isolation groove (154, 2524, 3524), the surface tension isolation groove (154, 2524, 3524) is configured to isolate tension for liquid in the liquid storage grooves (1510, 1520, 2522, 3522, 440), the air backflow groove (153, 2523, 3523, 420) and the surface tension isolation groove (154, 2524, 3524) are respectively disposed at two opposite sides of the air-liquid equilibrium element (150, 250, 350), and the air backflow groove (153, 2523, 3523, 420) is communicated with the air inlet (1430, 213, 3211) through the surface tension isolation groove (154, 2524, 3524).