An atomizer , comprising: a reservoir , the reservoir being configured for storing tobacco liquid; an atomizing assembly , the atomizing assembly being disposed inside the reservoir , at an end of the reservoir defining the lower end, and configured to absorb tobacco liquid for atomization; and a blocking component , the blocking component being disposed in the reservoir , and configured for blocking tobacco liquid in the reservoir when tobacco liquid flows from the lower end of the reservoir toward an end of the reservoir defining the upper end, such that tobacco liquid is kept around the atomizing assembly ; wherein the atomizer further comprises a gas tube and a mouthpiece ; the mouthpiece is disposed at the upper end of the reservoir ; the gas tube is configured for communicating the atomizing assembly and the mouthpiece ; the blocking component comprises a blocking ring fixed on the gas tube; an outer surface of the blocking ring abuts against an inner surface of the reservoir ; wherein the blocking ring is fixed on a joint of the gas tube and the atomizing assembly ; a vent disposed on the blocking ring is configured for communicating the gas tube and the atomizing assembly ; characterized in that : the blocking component further comprises a first insert tube and a second insert tube at two sides of the blocking ring ; the first insert tube is inserted into a lower end of the gas tube for fixing and the second insert tube is inserted into an upper end of the atomizing assembly for fixing; the vent is also configured to be in communication with the first insert tube and the second insert tube . a reservoir , the reservoir being configured for storing tobacco liquid; an atomizing assembly , the atomizing assembly being disposed inside the reservoir , at an end of the reservoir defining the lower end, and configured to absorb tobacco liquid for atomization; and a blocking component , the blocking component being disposed in the reservoir , and configured for blocking tobacco liquid in the reservoir when tobacco liquid flows from the lower end of the reservoir toward an end of the reservoir defining the upper end, such that tobacco liquid is kept around the atomizing assembly ; wherein the atomizer further comprises a gas tube and a mouthpiece ; the mouthpiece is disposed at the upper end of the reservoir ; the gas tube is configured for communicating the atomizing assembly and the mouthpiece ; the blocking component comprises a blocking ring fixed on the gas tube; an outer surface of the blocking ring abuts against an inner surface of the reservoir ; wherein the blocking ring is fixed on a joint of the gas tube and the atomizing assembly ; a vent disposed on the blocking ring is configured for communicating the gas tube and the atomizing assembly ; characterized in that : the blocking component further comprises a first insert tube and a second insert tube at two sides of the blocking ring ; the first insert tube is inserted into a lower end of the gas tube for fixing and the second insert tube is inserted into an upper end of the atomizing assembly for fixing; the vent is also configured to be in communication with the first insert tube and the second insert tube . <EOS>