An atomizer, comprising: an e-liquid tank comprising a top end, a bottom end, a mouthpiece, a cavity for storing an e-liquid, and an air conduction tube connected to the mouthpiece; the air conduction tube comprising a sidewall having an inner wall and an outer wall, and an air conduction channel confined by the inner wall; a seal member for sealing the cavity, the seal member comprising a sidewall having an inner wall and an outer wall, an atomizing channel confined by the inner wall of the seal member, and two e-liquid inlets each extending through the inner wall and the outer wall of the seal member; and an e-liquid absorbent member for atomizing the e-liquid to produce a vapor, the e-liquid absorbent member comprising two ends and a surface extending between the two ends; wherein: the mouthpiece is disposed on the top end of the e-liquid tank; the seal member is disposed on the bottom end of the e-liquid tank; the two e-liquid inlet are communicated with the cavity; the e-liquid absorbent member is disposed in the atomizing channel; the two ends of the e-liquid absorbent member abut against the inner wall of the seal member, and the two e-liquid inlets are blocked respectively by the two ends of the e-liquid absorbent member; the e-liquid absorbent member is adapted to absorb the e-liquid from the cavity via the two e-liquid inlets; the air conduction tube is disposed in the atomizing channel, and the air conduction channel is connected to the atomizing channel to form an airflow channel for conveying the vapor out of the atomizer; the outer wall of the air conduction tube abuts against the inner wall of the seal member; characterised in that: a groove is indented from the inner wall of the seal member towards the outer wall of the seal member; and the groove extends along a portion of the inner wall of the seal member that abuts against the outer wall of the air conduction tube; the groove is connected to the cavity and the air conduction channel; and the groove is adapted to convey ambient air from the mouthpiece into the cavity through the air conduction channel so as to equalize the pressure in the cavity with the pressure in the airflow channel. an e-liquid tank comprising a top end, a bottom end, a mouthpiece, a cavity for storing an e-liquid, and an air conduction tube connected to the mouthpiece; the air conduction tube comprising a sidewall having an inner wall and an outer wall, and an air conduction channel confined by the inner wall; a seal member for sealing the cavity, the seal member comprising a sidewall having an inner wall and an outer wall, an atomizing channel confined by the inner wall of the seal member, and two e-liquid inlets each extending through the inner wall and the outer wall of the seal member; and an e-liquid absorbent member for atomizing the e-liquid to produce a vapor, the e-liquid absorbent member comprising two ends and a surface extending between the two ends; the mouthpiece is disposed on the top end of the e-liquid tank; the seal member is disposed on the bottom end of the e-liquid tank; the two e-liquid inlet are communicated with the cavity; the e-liquid absorbent member is disposed in the atomizing channel; the two ends of the e-liquid absorbent member abut against the inner wall of the seal member, and the two e-liquid inlets are blocked respectively by the two ends of the e-liquid absorbent member; the e-liquid absorbent member is adapted to absorb the e-liquid from the cavity via the two e-liquid inlets; the air conduction tube is disposed in the atomizing channel, and the air conduction channel is connected to the atomizing channel to form an airflow channel for conveying the vapor out of the atomizer; the outer wall of the air conduction tube abuts against the inner wall of the seal member; a groove is indented from the inner wall of the seal member towards the outer wall of the seal member; and the groove extends along a portion of the inner wall of the seal member that abuts against the outer wall of the air conduction tube; the groove is connected to the cavity and the air conduction channel; and the groove is adapted to convey ambient air from the mouthpiece into the cavity through the air conduction channel so as to equalize the pressure in the cavity with the pressure in the airflow channel.