A rigid polyvinyl chloride sound barrier comprises raw materials of 70-90 parts of polyvinyl chloride, 2-12 parts of anti-impact modifier, 4-14 parts of filler, 6-7 parts of composite stabilizer, 0.5-1 parts of ultraviolet inhibitor, 0.5-2 parts of lubricant and 0.01-2 parts of colorant. The preparation includes adding polychloroethylene into heating blend agitator with low rotate speed, increasing rotate speed, adding anti-impact modifier, filler, composite stabilizer, ultraviolet inhibitor, lubricant, and colorant, mixing, heating to the temperature of 100-140 DEG C., discharging the material to cold blend agitator, decreasing temperature to 50 DEG C., discharging, filtering, delivering to extrusion group, cooling and pressing by plate die to produce special plate for sound barrier, which includes back board, front board and connecting board, punching sound absorption holes on front board with a opening ratio ranging 8-30%, a diameter ranging 1-4 millimeters, assembling to form the sound barrier. The sound barrier is light in weight, easy to process, good in corrosion resistance, low in price, easy to install, great heat durability, reusable, with long life and small workload of maintenance.