Sound absorber and air conditioner

The invention belongs to the technical field of acoustic noise reduction, and particularly relates to a sound absorber and an air conditioner. The sound absorber comprises a sleeve arranged on the pipeline, and a main air channel communicated with the sound wave channel and a plurality of branch air channels communicated with the main air channel are formed in the sleeve; and the plurality of first metamaterial resonators are arranged in the sleeve and are communicated with the corresponding branch air channels. According to the sound absorber and the air conditioner, it is guaranteed that airflow flows smoothly, and the ventilation effect is guaranteed.