The utility model relates to a constant flame fire burner belonging to the technical field of burners. The burner includes a burning chamber. The burning chamber is in a barrel shape and air inlets are arranged on the surrounding barrel walls in interval. A top part cover is provided with a rain cover and one side of the lower part is provided with an ignition nozzle. The center of the lower part is communicated with a mixing chamber. The bottom part of the mixing chamber is connected with a fuel gas nozzle through a screw interface. When in work, the fuel gas with a certain pressure injects into the mixing chamber from the nozzle and mixes with the air injected and then enters the burning chamber to burn. As the mixing air injected by the nozzle is easier to ignite, and the burning intensity and the flame temperature are improved, as the protection of the rain cover, the utility model can effectively resist wind and rain and keep stable burning for long time.