An atomizer, comprising an e-liquid tank and an end cover, the end cover comprising a main body; the main body comprising an outer peripheral wall, and the outer peripheral wall comprising an annular recess for air circulation; and the annular recess comprising a wall comprising an air inlet and an air vent; wherein: the main body further comprises an air passage; the air inlet communicates with the air passage; the air passage extends from a proximal end toward a distal end of the main body; a first tube is disposed on the distal end of the main body and communicates with the air passage; the main body is disposed on one end of the e-liquid tank, and the annular recess and an inside wall of the e-liquid tank forms a closed space; or the end cover comprises a seal wall for sealing the annular recess of the main body, the seal wall is integrated with or detachably connected to the main body, and the end cover is connected to one end of the e-liquid tank; the atomizer further comprises an atomizing assembly comprising a hollow position limiter and a heating element; one end of the hollow position limiter is disposed in the air passage and the other end of the hollow position limiter is disposed in the e-liquid tank; the hollow position limiter comprises at least one second fill hole; the at least one second fill hole is in the e-liquid tank; the heating element is disposed in the hollow position limiter and is opposite to the at least one second fill hole; a proximal end of the air passage is sealed with a holder; the holder is disposed on one end of the hollow position limiter and the heating element is fixedly disposed on the holder; the heating element comprises a pin; one end of the holder away from the hollow position limiter comprises a fastener, and the pin of the heating element is fixed on the fastener; the e-liquid tank comprises a mouthpiece and a vapor channel communicating with the mouthpiece; one end of the position limiter abuts against the vapor channel, and is disposed in or outside the vapor channel; and a seal is disposed between an inner wall of the air passage and an outer wall of the position limiter; and/or a third seal is disposed between the vapor channel and the position limiter; the main body further comprises a first fill hole extending from the proximal end toward the distal end of the main body, and an oil plug is disposed on the first fill hole; and/or a protective cover is disposed on the proximal end of the main body; characterised in that: the main body further comprises an e-liquid channel communicating with the air vent disposed on the wall of the annular recess; and the e-liquid channel is disposed on the distal end of the main body and comprises an open end communicating with an e-liquid tank and a blind end; and a third tube is disposed on the distal end of the main body and communicates with the e-liquid channel. the main body further comprises an air passage; the air inlet communicates with the air passage; the air passage extends from a proximal end toward a distal end of the main body; a first tube is disposed on the distal end of the main body and communicates with the air passage; the main body is disposed on one end of the e-liquid tank, and the annular recess and an inside wall of the e-liquid tank forms a closed space; or the end cover comprises a seal wall for sealing the annular recess of the main body, the seal wall is integrated with or detachably connected to the main body, and the end cover is connected to one end of the e-liquid tank; the atomizer further comprises an atomizing assembly comprising a hollow position limiter and a heating element; one end of the hollow position limiter is disposed in the air passage and the other end of the hollow position limiter is disposed in the e-liquid tank; the hollow position limiter comprises at least one second fill hole; the at least one second fill hole is in the e-liquid tank; the heating element is disposed in the hollow position limiter and is opposite to the at least one second fill hole; a proximal end of the air passage is sealed with a holder; the holder is disposed on one end of the hollow position limiter and the heating element is fixedly disposed on the holder; the heating element comprises a pin; one end of the holder away from the hollow position limiter comprises a fastener, and the pin of the heating element is fixed on the fastener; the e-liquid tank comprises a mouthpiece and a vapor channel communicating with the mouthpiece; one end of the position limiter abuts against the vapor channel, and is disposed in or outside the vapor channel; and a seal is disposed between an inner wall of the air passage and an outer wall of the position limiter; and/or a third seal is disposed between the vapor channel and the position limiter; the main body further comprises a first fill hole extending from the proximal end toward the distal end of the main body, and an oil plug is disposed on the first fill hole; and/or a protective cover is disposed on the proximal end of the main body; the main body further comprises an e-liquid channel communicating with the air vent disposed on the wall of the annular recess; and the e-liquid channel is disposed on the distal end of the main body and comprises an open end communicating with an e-liquid tank and a blind end; and a third tube is disposed on the distal end of the main body and communicates with the e-liquid channel.