The present invention relates to an electronic cigarette and a heating assembly thereof. The heating assembly comprise: a porous member for absorbing an e-liquid and at least one heating member for heating and atomizing the e-liquid absorbed by the porous member. The at least one heating member comprises an elongated sheet-shaped heating portion. At least part of the sheet-shaped heating portion is partially embedded in the porous member. The porous member comprises an atomization surface corresponding to the at least part of the sheet-shaped heating portion. In the present invention, a heating member of a heating assembly comprises a sheet-shaped heating portion embedded in a porous member, such that a majority of a surface of the sheet-shaped heating portion is in contact with the porous member, thereby improving heat dissipation efficiency, and ensuring secure connection.