The invention discloses a portable cup, including a cup body (1) with an opening at the upper end. The cup body (1) is an inverted circular truncated cone structure of a large top and small bottom andthe material is waterproof and flexible material. A plurality of reinforcing rings (2) are arranged at intervals on the vertical direction of the outer wall of the cup body (1). The reinforcing rings(2) in the middle part of the cup body (1) are formed by connecting with the left and right arc blocks (21) in clamp, and the arc blocks (21) are respectively and removably connected with the cup body (1). The portable cup is provided with the reinforcing rings (2) at intervals on the cup body (1), thereby strengthening the structure of the cup body (1). Meanwhile the reinforcing rings (2) in themiddle part of the cup body (1) are arranged into the two arc blocks (21) which are formed by connecting in clamp, and the arc blocks (21) are removably connected with the cup body (1). The arc blocks (21) can be removed when used in practice. The two ends of the arc blocks (21) are placed on the opposite side of the upper and lower reinforcing rings (2), thereby supporting cup body (1), therebybeing capable of placing the cup body (1) separately.