An atomizer includes a shell, an electronic system and a heating body. The heating body includes an atomization piece of a flat structure and a heating film attached to the bottom surface of the atomization piece. The shell has a receiving chamber. The atomization piece is matched with the bottom of the receiving chamber in shape and is laid at the bottom of the receiving chamber in a sealing manner. The bottom of the receiving chamber is hollowed out, exposing the heating film. The electronic system in the shell is electrically connected with the heating film. A heating body of a columnar structure of existing atomizers is replaced with the atomization piece, and the atomization piece is matched with the bottom of the receiving chamber in shape and is laid at the bottom, so that a surface heating structure easy to clean is formed, liquid is uniformly heated and atomized.
