The invention provides a cup cover label assembling machine and belongs to the technical field of machines. The cup cover label assembling machine comprises a base and a fixing frame, wherein the fixing frame is arranged on the base, a lower mould is arranged on the base, an upper mould is arranged on the fixing frame and is opposite to the lower mould up and down, the fixing frame is respectively provided with a lifting mechanism and an overturning mechanism, the lifting mechanism is used for driving the upper mould to move up and down, the overturning mechanism is used for driving the uppermould to rotate, a cup cover surface is arranged on the lower mould, a label surface is arranged on the upper mould and is opposite to the cup cover surface of the lower mould after being overturned by the overturning mechanism, and the lifting mechanism drives the upper mould to move downward so that the label surface and the cup cover surface are connected in an adhesion manner. The cup cover label assembling machine provided by the invention has the advantages that the structure is simple, the assembly can be automatically finished by the overturning mechanism and the lifting mechanism, the operation is labor-saving and time-saving, and the production efficiency and the yield of product assembly are improved; and in addition, the upper mould and the lower mould are replaceable, and thecup cover label assembling machine provided by the invention can be suitable for assembling various label plates.