Phase change heat preservation cup cover with size adjustable

The invention relates to the technical field of food heat preservation and provides a phase change heat preservation cup cover with the size adjustable. The phase change heat preservation cup cover comprises a cup cover outer layer and a cup cover inner layer, and the space between the cup cover inner layer and the cup cover outer layer is divided into a plurality of heat preservation units; the heat preservation units are internally provided with phase change heat preservation materials; one end of the cup cover outer layer is provided with a nylon fastener tape, the other end of the cup cover outer layer is correspondingly provided with a nylon fastener tape bonding layer, and the bonding position of the nylon fastener tape can be adjusted according to the size of a cup. The phase change heat preservation cup cover can be matched with cups of various different sizes just by changing the bonding position of the nylon fastener tape, and operation is convenient and simple; the phase change materials are arranged in the multiple independent heat preservation units in a split mode, the problem that in the prior art, the phase change materials are uneven in distribution after being converted into liquid is solved, and heat transfer can be more even and efficient; the cup cover is made of soft materials and divided into the multiple independent heat preservation units, so that the cup cover can be folded, space is saved, and the cup cover is convenient to carry.