The invention belongs to the technical field of air conditioners, and particularly relates to a low-
noise central air conditioner which comprises a fan coil, a
noise reduction box is arranged outside the fan coil and used for isolating
noise generated by the fan coil, the fan coil comprises a box body, an air inlet is formed in one end of the box body, and an air outlet is formed in the other end of the box body. An air blowing
assembly, a first
noise reduction mechanism, a second
noise reduction mechanism and a
heat exchanger are sequentially arranged in the box body, and the air blowing
assembly is configured to form directional
airflow; the directional
airflow is subjected to two-stage
noise reduction treatment through the first noise reduction mechanism and the second noise reduction mechanism in sequence, then exchanges heat with the
heat exchanger and is finally blown out from the air outlet; the first noise reduction mechanism comprises a first shell, two
spoiler sets are arranged in the first shell, the
spoiler sets are in transmission fit with driving parts, the driving parts are electrically connected with a
microcontroller, and the
microcontroller controls the inclination angles of the
spoiler sets according to the
air volume of the directional
airflow so as to reduce the air noise. And two-stage progressive
processing of noise is achieved, and the noise reduction effect is good.