An electronic cigarette comprising an atomizing assembly and a battery assembly is provided. A connection structure is mounted at a butt-joint position between the atomizing assembly and the battery assembly, and the connection structure includes a first connection member and a second connection member; a buckle protrudes from an outer side of the first connection member; a guiding groove matching with the buckle is defined in an inner side of the second connection member, and a buckling groove is defined in the circumference of the inner wall of the second connection member, and the buckling groove communicates with the guiding groove and is configured to enable the buckle to slide therein; the buckle is inserted into the second connection member along the guiding groove and is rotated along the buckling groove to connect the first connection member with the second connection member fixedly.