The invention discloses a coffee cup having a function of achieving self-help addition of syrup, in order to solve the problem that a user, who wants to adjust the sweetness of coffee, needs to add the syrup in a kitchen. According to the technical scheme, an infusion tube, a pressing head and a liquid storage bucket are arranged on a cup handle; two end faces of the liquid storage bucket are connected to the infusion tube and the pressing head; a spring, a piston, a ball body and a piston groove are arranged in the liquid storage bucket; the piston is located within the piston groove and is capable of relatively moving up and down in the piston groove; two end faces of the piston are connected to the pressing head and the spring; the infusion tube is blocked by virtue of the ball body andthe ball body is connected to one end of the spring; the pressing head is hollowed out, and a liquid outlet pipe is arranged in the hollowed part of the pressing head; one end of the liquid outlet pipe is connected to the piston and the other end extends onto the cup wall of a cup body; a sliding hole is formed in the cup body; by virtue of the sliding hole, the liquid outlet pipe can move up anddown; liquid holes are kept in the groove wall of the piston groove and the pressing head; a syrup device is arranged at the bottom end of the cup body; and the infusion tube is located within the cup handle and extends into the syrup device along the cup handle. By changing the capacity of the interior of the liquid storage bucket, the syrup can flow into the cup body.