A burning device includes a body and an air amplifier mounted in the body. The air amplifier includes a fuel channel between an inlet and an outlet of the air amplifier. The fuel channel includes an intermediate section between an inlet section and an outlet section. A width of the inlet section gradually decreases from the inlet towards the intermediate section. A width of the outlet section gradually increases from the intermediate section towards the outlet. A width of the intermediate section is smaller than the width of the inlet section and the width of the outlet section. The air amplifier includes a plurality of side channels. Each side channel extends along an extending axis not intersecting with a longitudinal axis of the fuel gas channel and includes an inner end intercommunicating with the fuel channel and an outer end intercommunicating with an outer periphery of the air amplifier.