Packaging box with heat preservation structure

The packaging box with the heat preservation structure comprises a packaging box body, a cover plate is arranged above the packaging box body, annular installation grooves are downwards formed in the periphery of the upper portion of the packaging box body, a fixing ring is fixed to the peripheral side of the bottom of the cover plate, annular air bags are arranged in the annular installation grooves, and the annular air bags are arranged in the annular installation grooves. Fixing mechanisms used for fixing the fixing rings and the annular mounting grooves are arranged on the inner walls of the two sides of the packaging box body, an air inlet channel extending out of the packaging box body is formed in one side of the annular air bag, and a piston is arranged at an air outlet of the air inlet channel; according to the packaging box, the fixing ring at the bottom of the cover plate can be inserted into the annular mounting groove and then fixed through the fixing mechanism, the air bag is inflated to extrude