The invention provides a flameless heating device. A heat release oxidation reaction of oxygen-bearing gas is mainly used under the action of platinum group catalysts, the released heat energy can conduct heat exchange with relatively low temperature liquid, and thus the temperature of the liquid rises. In the meanwhile, no flame and no combustion are generated in the liquid heating process, and the heating device belongs to a flameless heating device. The flameless heating device comprises a vertical bucket body, a gas inlet device and an exhaust device. A conveying path used for oxygen-bearing gas to flow and a conveying path used for the liquid to flow are arranged in the vertical bucket body. The conveying path for the oxygen-bearing gas can be arranged in the middle of the conveying path for liquid flowing, or the conveying path for liquid flowing is surrounded by the conveying path for the oxygen-bearing gas. Then the oxygen-bearing gas carries out the heat release oxidation reaction under the action of the platinum group catalysts, the released heat energy conducts heat exchange with the liquid in the liquid conveying path to heat the liquid, and thus the temperature of theliquid rises.