The invention provides a dual-mic denoising system and a dual-mic denoising method of an earphone. The method comprises the steps as follows: a master mic collects a voice signal, and sends the collected voice signal to a voice activity detection module to detect the voice signal; the voice signal is sent to a noise parameter computation module, and meanwhile, an auxiliary mic collects an environment sound signal, and sends the environment sound signal to a noise parameter computation module; the noise parameter computation module computes noise suppression strength; the voice signal and the environment sound signal are sent to the noise suppression module; and the noise suppression module performs noise suppression treatment on the voice signal and the environment sound signal, and outputs the processed signal. According to the system and the method provided by the invention, the auxiliary mic is used for collecting environment noise to suppress the noise in a call of the master mic on the basis of denoising actively, so that the non-stable noise in the environment is filtered while the stable noise is effectively suppressed.