Power source plug

The utility model relates to a power source plug which is composed of an inner tube, an outer tube, an inserting piece, a conducting wire, etc., wherein the inner tube is provided with the inserting piece which is led out by the conducting wire and the outside of the inner tube is inserted with the outer tube. The positive and the negative conducting wires are divided by the connected relation of the inner tube and the outer tube. The utility model has safety, non short circuit and long service life and the manual assembly can be realized without using any tool. The utility model can be widely used in the AC or DC power supply.