Atomizer and electronic cigarette having same

An atomizer comprising:

• a liquid supply and an atomizing assembly detachably connected with the liquid supply, the liquid supply having a liquid chamber configured for storing tobacco liquid, the liquid supply comprising a sealing piece at an end, the sealing piece defining a liquid outlet;
• wherein the atomizing assembly comprises a connecting part, the liquid supply comprises an engaging part matching with the connecting part, the engaging part comprises a rotary sealing element rotatable relative to the sealing element, when the liquid supply and the atomizing assembly are disassembled, the rotary sealing element seals the liquid outlet;
• when the connecting part is inserted into the engaging part and rotated a first angle, the atomizing assembly and the liquid supply are engaged to form a snap fit connection;
• when the atomizing assembly is further rotated a second angle relative to the liquid supply, the atomizing assembly drives the rotary sealing element to rotate to open the liquid outlet, so that the tobacco liquid in the liquid chamber flows into the atomizing assembly via the liquid outlet.