Disclosed is an environment-friendly heat-insulation cup sleeve. The cup sleeve is suitable for sleeving a cup and comprises a sleeve body capable of being spread for sleeving the cup. The sleeve bodycomprises an insulation layer attached to the outer peripheral surface of the cup, a spraying-film lamination layer arranged around the outer peripheral surface of the insulation layer and a smooth layer arranged around the outer peripheral surface of the spraying-film lamination layer. The insulation layer is made of foamed polyethylene, the spraying-film lamination layer is made of polyethylene, and the smooth layer is made of thermoplastic plastic. Since the sleeve body is low in weight and small in size and has a heat insulation effect under certain thinness, the use quantity of the materials can be greatly reduced during manufacturing, and the cup sleeve is more environmentally friendly. In addition, the smooth layer of the device body can provide an excellent grip hand feeling for auser, and meanwhile the whole cup sleeve can be attractive due to high printing resolution.