The invention relates to a gas fuel catalyst burner, which can be used to heat system. Wherein, the pre-mixing room (1) has a air guide tube (2) and a cyclone guide surface (3) to mix the fuel gas andthe air uniformly; the catalyst burning room is formed by two catalyst burning rooms as fuel-rich area and fuel-lack area; the second fuel or air mixing room (10) is arranged between two catalyst burning rooms, which comprises four tangential fuel gas or air nozzles (11) to form the cyclone to mix the secondary fuel gas and air and fuel gas uniformly; and a metallic porous plate (4) is between the pre-mixing room and the first catalyst burning room to avoid backfire. The invention can realize high efficiency and lower discharge.