Food packaging bag with fresh-keeping function

The utility model discloses a food packaging bag with a fresh-keeping function, which comprises a packaging bag body, a protective layer is arranged in the packaging bag body, the protective layer comprises a fresh-keeping layer, a damp-proof layer, an oxygen isolation layer and a shading layer, and the damp-proof layer is arranged at the top of the fresh-keeping layer. According to the vacuum packaging bag, the air outlet pipe, the air pump connector and the sealing mechanism are matched, the external air extracting pump is communicated with the air pump connector, air in the inner cavity of the packaging bag body is extracted, the interior of the packaging bag body is in a vacuum state, and the first baffle and the second baffle are staggered with each other by rotating the nut; according to the packaging bag, the packaging bag body is provided with the fresh-keeping layer, external air is further not prone to entering the packaging bag body, the sealing effect of the packaging bag body is better, by design