A working method of a double-linkage conveyor discharge valve comprises the following working steps: first step, controlling a motor to rotate, driving a third angle gear to rotate through a reducingmechanism, driving a first angle gear and a second angle gear to rotate simultaneously by the third angle gear, driving a valve rod to rise by the second angle gear through a rod sleeve, driving pivotrods and a closing piece to rise for storage operation by the valve rod, opening a material hole for discharging, and meanwhile rotating a movable valve plate to a position where the movable valve plate is closed relative to a fixed valve plate so as to close a weighing cavity; and second step, after discharging is performed for a scheduled time, controlling the motor to rotate reversely, controlling the closing piece to close the material hole through a transmission structure, meanwhile rotating the movable valve plate to a position where the movable valve plate is opened relative to the fixed valve plate, feeding the materials into the weighing cavity, and when the materials in the weighing cavity reach a scheduled weight, successively repeating the first step and the second step.