Mechanism for lifting/lowering plastic-film of green-house

The utility model discloses a plastic film mechanism for lifting and lowering of greenhouses, which is a manual device for lifting and lowering which is especially suitable for the inner film of four walls of plastic greenhouses with single film and double layers. The utility model is characterized in that an exit opening of a single double outing swing machine (1) is sheathed with a rotating shaft (2), and through the positive rotation and the reverse rotation of a crank handle, the lifting and lowering of the film is controlled so as to realize the ventilation of greenhouses. The utility model has the advantages of compactness, facility and convenient operation, and besides, the utility model completely solves the problem of the ventilation of greenhouses.