The embodiment of the utility model discloses a rapid cooling water cup cover which comprises a cylindrical shell and a cup-shaped first heat insulation layer connected in the shell in a sleeved mode,and a cylindrical second heat insulation layer is contained in the first heat insulation layer. The bottom surface of the second heat insulation layer is tightly matched with the upper bottom surfaceof the first heat insulation layer and can rotate around a rotating shaft embedded into the bottom surface of the second heat insulation layer and the upper bottom surface of the first heat insulation layer; wherein a first heat conduction sheet is arranged on the lower bottom surface of the first heat insulation layer, and a first heat conduction column is vertically connected to the first heatconduction sheet; a second heat conduction sheet is arranged on the top surface of the second heat insulation layer, and a second heat conduction column is vertically connected below the second heat insulation layer; when the second heat insulation layer rotates around the rotating shaft to a certain position, the upper end face of the first heat conduction column is in close fit with the lower end face of the second heat conduction column. The water cup cover is used for solving the problem that hot water in an existing heat preservation cup is difficult to cool rapidly when needing to be drunk.