An electronic cigarette comprises a smoking unit and a power unit. The smoking unit attachably connects with the power unit as a unitary member by magnetism. A connecting end of the smoking unit and a corresponding connecting end of the power unit respectively comprise a connecting element which is made of iron material. A permanent magnet is disposed in at least one of the connecting end of the smoking unit and the corresponding end of the power unit. The connecting element of the connecting end of the smoking unit and the connecting element of the corresponding connecting end of the power unit are removably and insertedly connected to each other, and engaged with each other via an attractive force of the permanent magnet. The electronic cigarette can be assembled and disassembled conveniently and efficiently, and is easy for maintenance and replacement.