An electric heating device comprises an electric heating tube and a plurality of cooling fins connected onto the electric heating tube in a sleeving manner, wherein the cooling fin main body is planar sheet metal; revers are arranged on two symmetrical side edges of the cooling fin main body; a through hole is formed in the middle of the cooling fin main body; a flange is arranged on the through hole; the direction of the revers is opposite to that of the flange; the diameter of the flange is greater than that of the electric heating tube. The electric heating device adopts the independent cooling fins mounted on the electric heating tube in a sleeving manner to realize heat dissipation, is high in warming efficiency and very convenient to dismount, mount, repair and replace, can be used independently, and also can be mounted on other warming equipment.