An embodiment of the invention discloses a method for recovering the clock and the device thereof. The method comprises the following procedures: obtaining a first program clock reference signal of the transmission flow, and comparing the first program clock reference signal with the local system clock signal to obtain a first comparing signal; executing filtering procession to the first comparingsignal to obtain a second comparing signal, and obtaining the updated second program clock reference signal according to the history value of the second comparing signal and the second program clockreference signal; and obtaining the recovered first program clock reference signal according to the updated second program clock reference signal, the recording time of the second program clock reference signal recorded by the system fixed clock source and the current time of the system fixed clock source. The technical scheme of the embodiment of the invention uses the mode of software filteringandexecutes the circulating monitoring by tracing the first program clock reference signal. The first program clock reference signal is recovered and the network condition adaptability of the clock reco vering is increased.