The invention provides a burner device. The burner device comprises a burner main body, and the burner main body comprises an inner barrel and an outer barrel; the inner barrel is positioned on the inner side of the outer barrel; a fire spraying opening is formed in the burner main body; variable diameter structures are arranged on the inner barrel and the outer barrel; the variable diameter structures are arranged on the side close to the fire spraying opening; and the inner diameters of the sides, close to the fire spraying opening, of the variable diameter structures are smaller than the inner diameters of the sides away from the fire spraying opening. According to the technical scheme, the problems that the service life of a burner in the prior art is relatively short, maintenance costis relatively high, and the resource utilization rate is low are effectively solved.