Disposable cup sleeve

The utility model relates to a disposable cup cover with a flanging cup cover, the flanging of which can be sleeved on the upper end of a high-grade water cup. The lip of the drinker only contacts with the flanging of the disposable cup cover for a time to take the tea or drink in the cup and the cup can be thrown away after being used, which not only ensures the sanitation of the teacup but also prevents cross infection, avoids tea stain and fruit juice stuck to the internal wall of the high-grade teacup and saves cleaning time. If the lower part of the disposable cup cover is cut or only a circular casing part for lip contacting at the cup end is kept, the cost of the disposable cup cover can be reduced although the cleanness of the internal wall cannot be maintained. If only the arc case cover of the lip-contacted part of a circular ring casing is remained, the cost can be reduced and the practicality and the cross-infection prevention are obvious.