The invention provides an atomizing device with a double-layer heating structure. The atomizing device with the double-layer heating structure comprises a base, a lower cover, an atomizing core and anoil storage bin, wherein the inside of the base is provided with an accommodating cavity, a thick wall, an oil inlet hole and an air inlet hole; the lower cover covers the base, a gap is formed between the lower cover and the base, and the lower portion of the oil inlet hole is communicated with the gap; the atomizing core is mounted inside the accommodating cavity and composed of an internal shaft, an atomizing channel, an inner atomizing hole, a first heating mesh, a second heating mesh, a first case, a second case and a side case, the side case is provided with an outer atomizing hole which is communicated with the air inlet hole, the first case is provided with a first oil hole, and the second case is provided with a second oil hole which is communicated with the gap; the oil storagebin is used for accommodating tobacco oil; the tobacco oil enters the first heating mesh via the first oil hole, sequentially passes through the oil inlet hole, the gap and the second oil hole and enters the second heating mesh. The atomizing device with the double-layer heating structure replaces traditional oil conducting cotton with an oil way, thereby being novel in structure, meeting the demands of large lung smoking volume and avoiding dry burning.