Device for automatically opening and closing air vent of granary

The utility model discloses a device for automatically opening and closing an air vent of a granary. An air vent barrel (5) is linked with an air vent top cover (1) through a top cover hinge (6); a connection ring (2) is connected at the part of the top cover hinge (6) on the air vent top cover (1); the connection ring (2) and the air vent top cover (1) form a lever structure capable of rotating around the top cover hinge (6) through the top cover hinge (6); and an electric linear motion unit (3) drives the connection ring (2) to control the opening and closing of the air vent top cover (1). In the device for automatically opening and closing the air vent of the granary, an electric linear motion unit occupying a relatively small space can control the automatic opening and closing of the air vent top cover. The adverse situation that the current air vent is opened and closed mainly by manual operation or an automatic granary window opening/closing system cannot be installed in the limited space is changed, an