The invention belongs to the acoustical technical field and relates in specific to a novel non-fiber type and micropunched sound absorption type sound barrier body with transition cavity. The invention comprises a micropunched panel, a top face, a bottom face, a left end face, a right end face and a back plate; the micropunched panel, the top face, the bottom face, the left end face, the right end face and the back plate are connected to form a closed cavity; the cavity depth appears in a linear transition; the maximum depth is 2.5 to 3.5 times as the minimum depth. The micropunched panel is arranged with micropores with total occupied area of 0.5 percent to 3 percent of the panel area; the micropore aperture is 0.6 to 1.2mm. In actual use, it is only necessary to mount the invented device into a sound barrier vertical column or other places for sound absorption process. The invented device is characterized in being simple, easy and convenient manufacturing, thin shape and being light and having perfect sound absorption performances. Sound absorption band width with sound absorption factor higher than 0.4 exceeds 2 octaves. Therefore, the invention has advantages of broad application scope, easy purging, high-temperature resistance, and superior weather ability. Besides, the invented device can be completely recycled for use to thoroughly avoid the problem of secondary pollution, for which the invention has superior environmental protection function.