The invention records a sound insulation body for controlling road noise pollution. The sound insulation body for controlling road noise pollution comprises a foundation pier, an extended section and a sound insulation body arranged on the foundation pier. The upper end of the sound insulation body is provided with a strip groove, the extended section is slidably arranged in the strip groove and comprises a first light foaming ceramic layer, a sound insulation layer and a second light foaming ceramic layer which are sequentially arranged. The arrangement of the sound insulation body is used for isolation of noises generated by highways, and damage to health of the human body is avoided. The first light foaming ceramic layer and the second light foaming ceramic layer can absorb plenty of noises, the sound insulation layer can also be used for absorbing plenty of noises, foaming ceramics and the sound insulation layers are made of different materials, decibels of the absorbed noises are also different, and thus the extended section has a good sound insulation effect. In the sound insulation body, the extended section is slidably arranged in the sound insulation body, the height of a sound insulation wall can be adjusted according to actual conditions, and it is guaranteed that the noises generated by roads can be completely blocked and absorbed.