Abstract: This invention relates to a power fuel tank cover and in particular to one including a motor, a collar having a circular member and a tubular member formed at one side thereof, a worm rod inserted into the tubular member of the collar, a sleeve fitted into said collar, a worm gear mounted on the sleeve and engaged with the worm rod, an actuating cylinder with external threads being threadedly engaged with the center hole of the worm gear, a lid pivotally connected with an upper portion of the actuating cylinder and having a seat with a groove at a bottom, a positioning plate on a top and a hole extending through the seat and the positioning plate for receiving a ball, a plug and a spring, a connecting member pivotally connected between the collar and the lid, and a press plate threadedly engaged with the positioning plate by a screw connected with a linking rod via a ring which is in turn connected with a fixing plate, whereby the fuel tank may be automatically opened and closed simply by pressing a switch ne