An atomizer includes a housing and a liquid storage cup. The housing has a mouthpiece thereon. The liquid storage cup is provided in the housing and configured for storing tobacco liquid. The liquid storage cup has an opening at one end thereof. A microporous liquid conducting body is plugged inside the opening for conducting the tobacco liquid in the liquid storage cup into an atomizing unit. An atomizing unit is connected to the opening and configured for heating the tobacco liquid to generate aerosol. An air flow channel is provided between the mouthpiece and the atomizing unit. The atomizing unit includes a support, a liquid guiding component located in the support, and at least one vertically arranged heating sheet. The heating sheet includes a side surface in contact with the liquid guiding component.
