A heating device for an atomizing head of electronic cigarette is disclosed, including a sleeve-shaped heating element, and a liquid absorbing component wrapping around an outer surface of the heating element, the liquid absorbing component is formed by at least two liquid absorbing elements engaging each other. It is only required to position the liquid absorbing elements of the liquid absorbing component on the outer surface the heating element and engage the liquid absorbing elements together during assembling. The assembly can be quick and simple.