The invention discloses a sound absorber and a sound barrier with the same. The sound absorber comprises a body sound absorbing module, and the body sound absorbing module comprises panels and a first sound absorbing material; the sound absorber is characterized by also comprising an auxiliary sound absorbing module arranged at the top of the body sound absorbing module, and the auxiliary sound absorbing module comprises an outer frame and a second sound absorbing material arranged in the outer frame; the panels are arranged on the two sides of the first sound absorbing material, a plurality of through holes for airflow passing are formed in the panels and the outer frame, and the air flow-through performance at different positions of the first sound absorbing material is different; the specific implementation mode is that from the lower portion of the sound absorber to the upper portion of the sound absorber, the flow resistance and/or the surface density of the first sound absorbing material are/is gradually decreased.