Device for heating feed water of steam boiler

The utility model discloses a device for heating feed water of a steam boiler. The device comprises a dividing steam dome, a water tank and a pipeline, wherein the dividing steam dome is communicated with the water tank through the pipeline, and the pipeline is provided with a gate valve. According to the utility model, the dividing steam dome is communicated with the water tank, through controlling the gate valve, the steam in the dividing steam dome is introduced into the water tank, the water in a steam feed water tank, that is to say, feed water of the steam boiler, is used for heating. When the feed water is required by the steam boiler, the water at higher temperature is transmitted to the steam boiler, so that saturated steam is obtained in a shorter time, the fuel is saved, and the production cost is reduced.