Abstract: A power adapter includes a main body, electrical conductive terminals provided in the main body, and a plug. The plug includes a base, a first insertion piece and a second insertion piece. A first side of the base is formed with first directional grooves, and a second side thereof is formed with second directional grooves. The first insertion piece is provided with first insertion portions. The second insertion piece is provided with second insertion portions. The first side or second side of the plug penetrates the main body. The first insertion portion and the second insertion portion press the electrical conductive terminals, so that the first insertion piece and the second insertion piece are electrically connected with the electrical conductive terminals respectively. By this structure, the direction for the plug being inserted into a power socket can be changed based on practical demands.