Corner connecting device for road and bridge sound barrier

A corner connecting device for a road and bridge sound barrier comprises a box shell device which is arranged on a corner of the road and bridge sound barrier and provided with a transition cavity, a filling body (91) arranged in the box shell device, a first sound absorbing plate (1) and a second sound absorbing plate (2), and the first sound absorbing plate (1) and the second sound absorbing plate (2) are arranged on the box shell device. According to the road and bridge sound barrier, noise reduction treatment is carried out on the corners of the road and bridge sound barrier, triangular transition cavities are formed in the corners of the road and bridge sound barrier through the box shell device, noise reduction treatment is carried out in the box shell device through the filling body (91), and noise reduction materials for eliminating gaps are embedded in the corners of the road and bridge sound barrier; the technical problem that a gap is formed between two sound absorption plates located at a corner d