Cup lid capable of keeping beverage concentration constant

A cup lid for a beverage cup capable of containing a beverage therein, the cup lid comprising:

• a body coupled to the beverage cup so as to cover a top of the beverage cup;
• and
• a receiving portion disposed under the body and facing the at least a partial surface of the body, wherein at least a portion of an end of the receiving portion is connected to the body to form a space therebetween capable of containing coffee concentrate therein, wherein an injection hole through which the coffee concentrate is input into the space is formed in an upper end of the receiving portion, wherein one or more leak holes through which the coffee concentrate leaks into the cup under gravity are formed in an lower end of the receiving portion,
• wherein the receiving portion is composed of an upper surface as at least a partial surface of the body, and a lower surface facing the upper surface,
• wherein the injection hole through which the coffee concentrate is input into the space of the receiving portion is formed in one area of the upper surface of the receiving portion or at least a portion of an area where the upper surface and the lower surface are bonded to each other,
• wherein the coffee concentrate leaks through the leak hole into the beverage cup drop by drop at a predetermined time interval,
• wherein the receiving portion extends in a spiral manner from the body hole positioned at a center of the body to an outer edge of the body,
• wherein the injection hole is formed at a beginning position of the spiral extension, and the leak hole is formed at an end position of the spiral extension.