The utility model relates to a double-seal valve which structurally comprises a valve body for accommodating a valve core, the valve core with a hollow inner cavity and a valve cover for covering thevalve core in the valve body, and the valve core and a first opening and closing valve and a second opening and closing valve on the valve body are synchronously opened and closed in the rotating process of the valve core; an inner cavity of the valve body is a straight cylinder cavity, and the lower section of the inner cavity is a closing-in section with taper. The outer wall of the valve element is in a cylinder shape matched with an inner cavity of the valve body, the lower section of the outer wall of the valve element is a contraction section matched with the lower section of the inner cavity of the valve body, and the height of the valve element is smaller than that of the inner cavity of the valve body. The top face of the valve element is connected with a valve rod, the valve rodpenetrates out of a core hole of the valve deck, a threaded section is arranged on the valve rod, and a nut in threaded connection with the valve rod is arranged on the top face of the valve deck. Thevalve is more flexible and convenient to use, the bottom face of the valve element can be screwed and pressed on the bottom face of the inner cavity of the valve body through the additionally-arranged thread fit structure of the valve rod and the nut, and therefore the valve can be sealed more tightly, and leakage of the valve is completely eradicated.