Earphone and noise reduction processing method and device

The invention discloses an earphone and a noise reduction processing method and device. The earphone comprises a loudspeaking assembly, a microphone assembly, a first chip and a second chip, the first chip comprises a wireless transmission module, a first loudspeaker port, a first microphone port and a first digital audio port, the second chip comprises a second loudspeaker port, a second microphone port and a second digital audio port, and the first chip is used for determining whether noise reduction processing is performed through the second chip; when it is determined that the noise reduction processing is not carried out, the connection between the second loudspeaker port and the loudspeaking assembly is in a disconnected state, and the connection between the second microphone port and the microphone assembly is in a disconnected state; and under the condition that the noise reduction processing is determined to be carried out, the connection between the second loudspeaker port and the loudspeaking assem