The invention discloses a color-changing light shielding board, comprising at least two boards and a syringe. The at least two boards are closely arranged in parallel to form a cavity; the cavity is filled with a PH indicator; and the syringe is arranged in opposition to the cavity for injecting an acid solution or an alkaline solution into the cavity. At least two boards are closely arranged in parallel to form the cavity, the cavity is filled with the PH indicator and the acid solution or the alkaline solution is dropped in the cavity in order to achieve a goal of changing colors. Due to facts that the plurality of boards are arranged in parallel, a plurality of cavities are formed and color changing degrees of the PH value indicators in the plurality of cavities are different, many colors of the glass can be regulated, and, at the same time, a light shielding effect is achieved. The color-changing light shielding board is simple in structure.