The invention discloses an electric heating steel pipe of a heat exchanger. The electric heating steel pipe comprises an electric heating pipe which is of a tubular structure. A first electric heating wire is arranged in the electric heating pipe, and a second electric heating wire is arranged on the outer surface of the electric heating pipe in a winding mode. The second electric heating wire is arranged on the outer surface of the electric heating pipe in a spiral shape, one end of the electric heating pipe is provided with a first connector, and the other end of the electric heating pipe is provided with a second connector. The second connector is connected with the electric heating pipe through threads, and the first connector is connected with the electric heating pipe through threads. One end of the first electric heating wire is connected in the first connector in an inserted mode, and the other end of the first electric heating wire is connected in the second connector in an inserted mode. The electric heating pipe is externally connected with an electric heating piece. According to the electric heating steel pipe of the heat exchanger, the electric heating pipe is connected with the heat exchanger through the first connector and the second connector, the first electric heating wire is installed in the heat exchanger, the surface area of the first electric heating wire is greatly enlarged through the second electric heating wire so that the heat generating area of the first electric heating wire can be greatly enlarged, the heating area of the surface of the electric heating pipe can be enlarged through the electric heating piece, and the heat generating effect is better.