An atomizer, comprising: a main body; an atomizing component received in the main body; and a liquid chamber configured for receiving tobacco liquid, the atomizing component being configured for generating aerosol from the tobacco liquid; wherein the atomizing component and the liquid chamber cooperatively defining a liquid passage therebetween; the atomizer further comprises a liquid blocking element defining a notch, the liquid blocking element is capable of rotating relative to the main body between a first position where the liquid blocking element prevents the tobacco liquid in the liquid chamber from flowing into the liquid passage, and a second position where the notch is in alignment with the liquid passage, so that the tobacco liquid flows to the atomizing component via the liquid passage; wherein the atomizing component comprises a heating element and a liquid conducting element in contact with the heating element, the liquid conducting element is configured for absorbing the tobacco liquid, and the heating element is configured for heating the tobacco liquid in the liquid conducting element; characterized in that the liquid conducting element is supported by a bracket wherein the liquid conducting element and the bracket are positioned in the liquid blocking element; and the bracket is cylindrical and allows air to pass through; the bracket and the liquid blocking element cooperatively define a buffer chamber communicating with the liquid passage, and ends of the liquid conducting element insert into the buffer chamber. a main body; an atomizing component received in the main body; and a liquid chamber configured for receiving tobacco liquid, the atomizing component being configured for generating aerosol from the tobacco liquid; wherein the atomizing component and the liquid chamber cooperatively defining a liquid passage therebetween; the atomizer further comprises a liquid blocking element defining a notch, the liquid blocking element is capable of rotating relative to the main body between a first position where the liquid blocking element prevents the tobacco liquid in the liquid chamber from flowing into the liquid passage, and a second position where the notch is in alignment with the liquid passage, so that the tobacco liquid flows to the atomizing component via the liquid passage; wherein the atomizing component comprises a heating element and a liquid conducting element in contact with the heating element, the liquid conducting element is configured for absorbing the tobacco liquid, and the heating element is configured for heating the tobacco liquid in the liquid conducting element; characterized in that the liquid conducting element is supported by a bracket wherein the liquid conducting element and the bracket are positioned in the liquid blocking element; and the bracket is cylindrical and allows air to pass through; the bracket and the liquid blocking element cooperatively define a buffer chamber communicating with the liquid passage, and ends of the liquid conducting element insert into the buffer chamber. wherein the atomizing component and the liquid chamber cooperatively defining a liquid passage therebetween; the atomizer further comprises a liquid blocking element defining a notch, the liquid blocking element is capable of rotating relative to the main body between a first position where the liquid blocking element prevents the tobacco liquid in the liquid chamber from flowing into the liquid passage, and a second position where the notch is in alignment with the liquid passage, so that the tobacco liquid flows to the atomizing component via the liquid passage; wherein the atomizing component comprises a heating element and a liquid conducting element in contact with the heating element, the liquid conducting element is configured for absorbing the tobacco liquid, and the heating element is configured for heating the tobacco liquid in the liquid conducting element; characterized in that the liquid conducting element is supported by a bracket wherein the liquid conducting element and the bracket are positioned in the liquid blocking element; and the bracket is cylindrical and allows air to pass through; the bracket and the liquid blocking element cooperatively define a buffer chamber communicating with the liquid passage, and ends of the liquid conducting element insert into the buffer chamber.