The utility model discloses an electric power adapter, including adapter body, top one side of adapter body is provided with the adapter line, adapter body has seted up the louvre in one side, insideone side fixedly connected with heat absorbing sheet of adapter body, closely laminate and have the heat conduction stick in one side of heat absorbing sheet to the setting of aliging of heat conduction stick and louvre, bottom one side of adapter body is provided with first support, there is the dust guard through pivot swing joint on the first support, the one end fixedly connected with second support of dust guard, there is the support arm through pivot swing joint on the second support, the first magnet of one side upper portion fixedly connected with of support arm. This electric power adapter through the setting to first support, dust guard, second support, support arm, first magnet, supporting shoe, second magnet, interface, sealing plug, has reached and has sheltered from dirt -proof effect to the interface, guarantees the normal work of adapter, convenient to use.