The present disclosure relates to an atomizer includes an atomizing device and a liquid supply. The atomizing device includes an engaging part. The liquid supply includes a liquid chamber. The liquid supply includes a connecting end and a liquid outlet defined in the connecting end. The engaging part defines a liquid inlet through which tobacco liquid can flow into the atomizing device. The liquid supply further includes a sliding block slidable between a first position and a second position. When the sliding block is in the first position, the sliding block seals the liquid outlet； when the sliding block is in the second position, the liquid outlet is opened. The engaging part is capable of sliding along a predetermined track to form a snap-fit connection with the connecting end, and simultaneously driving the sliding block to move from the first position to the second position.
