Mobile phone heat-preserving device for use in extremely-cold environment

The invention discloses a mobile phone heat-preserving device for use in an extremely-cold environment. The mobile phone heat-preserving device consists of a heat-preserving lining, a heat-preserving metal plate and a high-capacity battery panel, wherein the heat-preserving lining comprises a high-capacity battery panel slot, a battery switch and a heat-preserving metal plate mounting groove; the heat-preserving metal plate is fixed on the heat-preserving metal plate mounting groove of the heat-preserving lining; the high-capacity battery panel is inserted into the high-capacity battery panel slot of the heat-preserving lining; the battery switch is used for controlling connection between the high-capacity battery panel and the heat-preserving metal plate. The mobile phone heat-preserving device has the advantages of simple structure, reasonable design, convenience in carrying during use, and high practicability.