High-efficiency energy saving heat supply device and heat supply method thereof

The invention discloses a high-efficiency energy saving heat supply device and a heat supply method thereof. The device comprises a casing and a liner arranged in the casing. A third heating cavity, a second heating cavity and a first heating cavity are sequentially and concentrically arranged in the liner at intervals. A heat conduction rod is arranged on the first heating cavity, and heat exchange pieces are arranged on the cavity walls of the first heating cavity, the second heating cavity and the third heating cavity. The heat supply device is ingenious and reasonable in structure design, capable of acquiring high temperature air quickly and efficiently through heating conducted by the first heating cavity, the second heating cavity and the third heating cavity sequentially, and the aim of supplying heat can be achieved. The plurality of heating cavities are arranged, the heat exchange effect is good, the energy utilization rate is greatly improved, meanwhile high temperature smoke is introduced to a smok