Water-soluble heat-shrink film is a thin film made of water-soluble polymer materials (such as polyvinyl alcohol). When heated, it shrinks in size through the heat-shrink effect, thus tightly wrapping items. Upon contact with water, the film dissolves or softens, giving it advantages in terms of environmental friendliness and biodegradability. Water-soluble film combines the environmental benefits of heat-shrink film with its high-efficiency packaging performance.