The invention discloses a self-adaption 
noise reduction device for 
low frequency noise in an indoor environment. The self-adaption 
noise reduction device for 
low frequency noise in the indoor environment comprises a primary 
microphone, an inverse sound source, a frequency adjusting device and a secondary 
microphone. The secondary 
microphone is a high-sensitivity omnidirectional 
electret secondary microphone with the 
response frequency ranging from 20Hz to 20KHz. The primary microphone and the secondary microphone are connected through an audio cable and a 16-bit analog-to-
digital converter respectively. The 16-bit analog-to-
digital converter is connected with an I / O read-write parallel interface of the frequency adjusting device through a 16-pin parallel interface 
bus. The reverse sound source is connected with an MCU processor of the frequency adjusting device through a serial analog-to-
digital converter. The self-adaption 
noise reduction device for 
low frequency noise in the indoor environment is particularly suitable for low 
frequency noise processing in a household environment, low 
frequency noise emitted by indoor electronic devices and 
electrical devices can be obviously reduced, the 
living environment is improved, and the living quality is improved. The self-adaption 
noise reduction device for low 
frequency noise in the indoor environment is small in size, capable of being used once a 
system is powered, free of a complex installation process, low in manufacturing cost and capable of being completely purchased and deployed by general users.