The invention provides a non-rising stem gate valve. The gate valve comprises a valve body, and a valve cover, a valve stem, a valve flap and a transmission device which are connected to the valve body, wherein the upper end of the valve stem is connected with the transmission device, and the lower end of the valve stem is connected with the valve flap; and the valve stem is relatively rotatably supported on the valve cover through a rolling bearing. The gate valve comprises an ultra-large torque safe transmission device which can effectively protect parts in the valve when operating torque is overlarge; a guide shoe is used for accurately positioning the valve flap in the rubber coating process, and rubber coating thickness is uniform; and the gate valve has small operating torque and long service life, and is reliably sealed and easy to assemble.