Integrated heating type thermoelectric refrigeration sheet

The utility model discloses an integrated heating type thermoelectric refrigeration sheet, which relates to the technical field of thermoelectric refrigeration sheets, and is characterized in that a first substrate with a built-in electric heating piece is arranged on a PCR (Polymerase Chain Reaction) instrument, and the thermoelectric refrigeration sheet is electrified to enable the contact surface of the first substrate and the PCR instrument to be a heating surface, so that the PCR instrument is heated by the thermoelectric refrigeration sheet; meanwhile, the electric heating piece is electrified, the electric heating piece generates joule heat, and heat is transmitted out through the first substrate, so that the first substrate of the thermoelectric refrigeration piece can obtain dual heat sources of heating capacity of the thermoelectric refrigeration piece and heating capacity of the electric heating piece in a heating mode, and the heating capacity of the thermoelectric refrigeration piece is greatly i