The invention relates to a cover structure of a mushroom space bag, which comprises a top cover, a base and a ventilating film, wherein the ventilating film is formed and fixed in the cover without displacement, and the large hole can be sealed, so as to improve the incomplete sealing of the ventilating film, enable the space bag to be completely imported into the automatic filling operation, and effectively reduce the production cost.本創作係有關於一種菇類太空包的封蓋結構，包含一上蓋、一底座及一透氣薄膜，其中該透氣薄膜成型固設在封蓋內，而不會移位，並可封合該大通孔，藉以改善該透氣薄膜封合不完全的缺失，使太空包可完全導入自動化裝填作業，有效降低生產成本者。
