Longspan internal heat preservation double-layer plastic film-covered greenhouse

The utility model discloses a longspan internal heat preservation double-layer plastic film-covered greenhouse, which belongs to the modern agricultural facilities construction field. The utility model is designed for overcoming the defects of low land utilization ratio and bad heat preservation performance of the traditional greenhouse in northwestern territories. A greenhouse framework mainly consists of an internal steel framework, an external steel framework and upright posts. An external layer adopts the double string framework and is covered with a thin film. An internal layer consists of the internal framework, a thin film, a guy wire-type curtain rolling machine and an insulating quilt. The internal framework adopts a single framework structure. The curtain rolling machine is arranged on a curtain rolling machine support which is arranged in the middle part of the top of the internal framework. A row of cement piers are arranged in the middle position of the greenhouse for installing the upright posts. The utility model has the advantages that: 1 low temperature effect around the greenhouse is reduced and land utilization ratio is improved, 2 the wind and snow resistant capability of the greenhouse is improved and at the same time, the heat preservation performance of the greenhouse is improved through the internal film insulating quilt, 3 the insulating quilt is arranged internally, therefore dismantlement is not needed, and time, labor and money are saved, and 4 a heat insulating layer between the two layers reduces great climatic change and is favorable to the melting of accumulated snow.