This machine is suitable for testing the thermal shrinkage performance of materials, suitable for testing the thermal shrinkage performance of various films in liquid medium at a variety of temperatures, such as wine, cans, mineral water, a variety of beverages, the overall collection of packaging with PE thermal shrinkage film, As well as PVC, POF, OPS, PET and other suitable for a variety of packaging shrinkage film, flexible packaging composite film, PVC polyvinyl chloride hard sheet, solar cell back plate and other materials with heat shrinkage performance.