▎ 摘　　要

NOVELTY - The utility model claims a cold chain logistics, product fresh-keeping, heat preservation; constant temperature storage field, specifically relates to a heat preservation bag for food preservation, comprising a bag body and a bag cover; the bag cover is connected on the bag body or clamped with the bag body by a clamping piece; the bag body and the bag cover are embedded with a heat preservation material layer; the bag cover or bag body is provided with a graphene heating sheet; the graphene heating sheet is electrically connected with a temperature control system and is provided with a temperature control switch and an external power supply socket; the temperature control switch and the external power supply socket are set on the outer surface of the bag body; the bag body comprises an outer bag and an inner bag; the heat preservation material layer is embedded between the outer bag and the inner bag; the graphene heating sheet is set between the inner bag and the insulating material layer; the inner surface of the bag cover is provided with a cavity part concave upwards.