The invention discloses an external pressure closer of a tobacco conveyor protective cover. The external pressure closer of the tobacco conveyor protective cover comprises a first hinge piece, and a second hinge piece connected with the tail part of the first hinge piece through a hinge shaft; at least two bias elements are positioned in the first hinge piece; a baffle plate is placed in the headpart of the first hinge piece; baffle plate holes as many as the bias elements are formed in middle of the baffle plate; ejector rods are inserted in the bias elements; the head parts of the ejector rods are rectangular rods whose widths are smaller than the inner diameters of the baffle plate holes; the head parts of the ejector rods penetrate through the baffle plate holes; circular grooves areformed in the tail parts of the ejector rods; the ejector rods are provided with limiting shaft tables near the circular grooves; the limiting shaft tables butt against the bias elements; the tail parts of the ejector rods are clamped on ejector rod shafts through the circular grooves; and the ejector rod shafts are riveted in the second hinge piece through ejector rod shaft mounting holes. In theexternal pressure closer of the tobacco conveyor protective cover, no material is hung; when incoming materials are uneven or blocked, a cover overturning door of the protective cover is automatically overturned to discharge the materials without blocking; and the structure is closed to stop dust and impurities from entering inside.