The utility model discloses an assembled concrete full -closed sound barrier, including sound barrier base, many pin along in the same direction as the bridge to the interval set up for seal cyclic annular crossbeam and lay between adjacent crossbeam surface with the horizontal bridge of crossbeam to the unanimous apron in cross -section, every pin crossbeam includes a slice top beam and two side crossbeams, side crossbeam one end and sound barrier base fixed connection, the other end and top beam fixed connection, the crossbeam that just inclines is unsmooth tooth mouth occlusal structure with the top beam junction, the horizontal bridge of every pin crossbeam to the cross -section be oval or circular, and the horizontal bridge of crossbeam is greater than bridge deck width to the maximum breadth in cross -section. The utility model discloses compare traditional gooseneck, do not need to maintain that the durability is good, reduce the volume of using the steel, promoted the economic nature of sound barrier, the defening effect is good, and the durability is good, and the cost is more cheap moreover, and fire behavior promotes greatly, adopted the whole curve molding of evagination, it is better than the pneumatic performance of the sound barrier of traditional vertical type.