The invention discloses a liquid collecting device. The liquid collecting device includes a tube body with an opening, the opening is connected with a space in the tube body, and one inner wall of the space is coated with Arabic gum. The invention further discloses a method for making the liquid collecting device. The method comprises the following steps: providing the tube body with the opening, wherein the opening is connected with the space in the tube body; allowing the opening to be in contact with an Arabic gum solution to make the space be full of the Arabic gum solution; removing parts of the Arabic gum solution from the space; and drying the tube body.