Defrosting aluminum pipe heater for refrigerator

The defrosting aluminum pipe heater for the refrigerator comprises an aluminum pipe, a heating wire and a terminal, wherein the heating wire and the terminal are arranged in the aluminum pipe. The aluminum pipe is provided with a first heating surface and a second heating surface which are parallel to each other, and a connecting bottom surface for connecting the first heating surface and the second heating surface; the first heating surface comprises a first U-shaped pipe, a first straight pipe, a second U-shaped pipe and a second straight pipe which are arranged up and down, the second heating surface comprises a third U-shaped pipe, a third straight pipe, a fourth U-shaped pipe and a fourth straight pipe which are arranged up and down, the third U-shaped pipe is lower than the first U-shaped pipe, and the bottom end of the third U-shaped pipe is connected with the top end of the vertically arranged third straight pipe; the fourth U-shaped pipe and the second U-shaped pipe are located in the same horizontal