The utility model relates to an improved infrared gas burner. The bottom of a furnace chamber of the burner is provided with a liquid discharge port; and water, oil or other impurities in a burner chamber body can be rapidly and conveniently discharged through the liquid discharge port, thereby realizing the long-term, stable and superior burning performance of the burner. The improved infrared gas burner has the obvious advantages of simple method, low cost, simple operation and reliable performance.