The present invention discloses a wearable electronic device having a plurality of trapezoid structures rotatably connected with one another. At least one inclined surface is formed on two ends of each trapezoid structure. When protruding sides of adjacent inclined surfaces of adjacent trapezoid structures abut against each other and sunken sides of the adjacent inclined surfaces of the adjacent trapezoid structures abut against each other, the plurality of trapezoid structures is formed in a ring shape. When the protruding sides and the sunken sides of the adjacent inclined surfaces of the adjacent trapezoid structures abut against each other, the plurality of trapezoid structures is formed in a straight shape.