An atomizer (100) includes a liquid reservoir (120) and a heating assembly. The liquid reservoir (120) has a liquid storage cavity (122) for receiving an atomizing liquid, wherein the liquid reservoir (120) has an opening end (121). The heating assembly (130) includes a liquid conducting body (131) and the heating element (132), the liquid conducting body (131) is located on the opening end (121), the conducting body (131) has a liquid absorbing surface (131a) facing an inside of the liquid storage cavity (122) and a atomizing surface (131b) located outside of the liquid storage cavity (131b), the heating element (132) is formed on the atomizing surface (131b), the liquid conducting body (131) is configured to conduct the atomizing liquid in the liquid storage cavity (122) to the atomizing surface (131b), and the heating element (132) is configured to atomize the atomizing liquid conducted to the atomizing surface (131b).