Circulating ventilation mechanism for modern agricultural greenhouse

The utility model relates to the technical field of agricultural greenhouse ventilation, and discloses a modern agricultural greenhouse circulating ventilation mechanism which comprises a mounting seat, a ventilation pipe is arranged in the mounting seat, an air outlet barrel is arranged on the left side of the ventilation pipe, a dustproof net is arranged on the inner side of the ventilation pipe, a frame body is arranged in the ventilation pipe, and the ventilation pipe is arranged in the frame body. An air blower is arranged on one side of the frame body, an air guide assembly extending to the left side of the air outlet barrel is arranged on the inner side of the air outlet barrel, and a driving assembly connected with the air guide assembly is arranged in the air outlet barrel. According to the circulating ventilation mechanism for the modern agricultural greenhouse, by arranging an air guide assembly and a driving assembly, a servo motor is started to drive a threaded rod to rotate forwards and backward