The invention discloses an efficient, clean and low-emission boiler. The efficient, clean and low-emission boiler comprises a coal mixing device, a boiler body, fuel and a combustion catalyst. Before entering the boiler body, the fuel and the combustion catalyst are sufficiently premixed in the coal mixing device, the sufficient combustion chemical reaction is achieved for the fuel and the combustion catalyst in the combustion process, the defects that a traditional boiler is not sufficient in combustion, low in combustion efficiency and high in pollutant emission can be overcome, and the pollution of combustion boiler smoke to the environment is reduced.