Electric heating furnace

The invention relates to the technical field of electric heating, and discloses an electric heating furnace which comprises a plurality of heating units, the lower portions of the heating units are communicated through a U-shaped water inlet pipe, the upper portions of the heating units are communicated through a U-shaped water outlet pipe, a descaling buffer tank is arranged on the U-shaped water inlet pipe, and the lower end of the descaling buffer tank is communicated with the U-shaped water inlet pipe. Water needing to be heated enters from the lower portions of the heating units, heated hot water is pressed out of the U-shaped water outlet pipe, the heating units conduct heating at the same time, the heating efficiency is high, the descaling buffer tank purifies water quality through descaling to avoid scaling, pressure buffering can be conducted on a pipeline, a descaling agent can be intermittently released, and the advantages of being simple in structure, high in heating efficiency, low in cost and th