New materials are adopted, which are non-toxic and tasteless, do not contain harmful substances, will not pollute food and will not endanger human health. The vegetable net bag of circular loom is usually made of polyethylene monofilament as warp and polypropylene flat filament as weft; Flat loom vegetable net bags are usually made of polypropylene flat yarn; There are also vegetable net bags with polyethylene monofilament in longitude and latitude. Polyethylene is recognized as the best material in contact with food in the world. Light and transparent, moisture-proof and oxygen resistant.