The invention discloses a light-emitting decorative accessory which includes a shaft, a first shoulder, a second shoulder, and a light-emitting module. The first shoulder and the second shoulder connect two opposite ends of the shaft respectively. The shaft has hollow space therein, and the outer diameter of the shaft is shorter than each outer diameter of the first shoulder and the second shoulder. The second shoulder has an upper surface with an aperture forming through the second shoulder and protruding to the hollow space inside the shaft. The light-emitting module includes a light-emitting unit, a circuit board, and a vibration switch for triggering the light-emitting unit. The light-emitting unit is electrically connected to the circuit board disposed on the upper surface of the second shoulder. The vibration switch is contained inside the hollow space inside the shaft and electrically connected to the circuit board.