An atomizer and an electronic cigarette having the same are disclosed. An atomizer includes an atomizing sleeve, with a reservoir formed therein; a heater, disposed inside the atomizing sleeve; as used herein, the heater includes: a quartz glass tube, hollow and with two ends open, a liquid conductive element, received in the quartz glass tube; the liquid conductive element is configured for absorbing tobacco liquid into the quartz glass tube and a heating element, sleeved on the quartz glass tube; the heating element generates infrared radiation to heat the tobacco liquid stored in the quartz glass tube.