The present invention provides an atomizing device and an electronic cigarette using the same. The atomizing device includes an outer sleeve, a liquid storage layer, a heating assembly, an atomizing elastic seat and a hard connecting assembly. The hard connecting assembly is inserted in the atomizing seat to elastically squeeze and tensioningly engage. The atomizing seat is adapted for the outer sleeve, and elastically expanded as a result of the connecting assembly being inserted in the elastic atomizing seat to be tightly sealed in the inner wall of the outer sleeve. The electronic lines are respectively tensioningly fixed in the elastic atomizing seat and electrically connect to the connecting assembly. The strength of the atomizing device is highly enhanced and assures further assembly. The atomizing seats is squeezed and sealed by the connecting head.
