The utility model relates to the technical field of composite films, in particular to a micro-foaming flexible
package composite film which comprises an outer layer film which is arranged on the outer surface, is in contact with the external environment and is resistant to abrasion, a middle layer film which is fixed on the outer layer film and is used for isolating gas,
moisture and light, and an inner layer film which is in contact with
package contents, adsorbs gas through a porous structure and insulates heat. The porous structure comprises an open pore structure for adsorbing gas and a closed pore structure for heat insulation and heat preservation, and the open pore structure and the closed pore structure are in gradient change; the utility model has the beneficial effects that: at the opening part of the foaming PE, foam holes are communicated with one another, and gas can be diffused through channels between hole walls, so that the internal air pressure of the
package is adjusted, and the risk of bag expansion is reduced; the foam holes in the closed hole structure are mutually closed, heat conduction can be effectively blocked, heat insulation and heat preservation effects are provided, meanwhile, the
impact strength of the material can be improved through the foam hole structure, and the material has the buffering performance in the transportation process.