Abstract: A portable chopstick including two-piece square chopsticks is provided. The two-piece square chopsticks include an upper chopstick body, a lower chopstick body and a chopstick body aligning structure. The upper chopstick body has a lower end joint block; the lower chopstick body has an opposite upper end joint groove. The chopstick body aligning structure can be separated into two parts, which are precisely positioned in the upper chopstick body and the lower chopstick bod respectively, wherein the upper chopstick body and the lower chopstick body can be made of different materials. When the lower end joint block of the upper chopstick body is locked with the upper end joint groove of the lower chopstick body, the upper chopstick body is aligned with the lower chopstick body through the chopstick body aligning structure at their four sides.