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Since the existing quasi-synchronous clock recovery scheme can not satisfy the jitter indicator of multi-relay tropospheric scatter communication, a low-jitter clock recovery scheme in a multi-relay tropospheric scatter channel is proposed. The scheme is implemented by a digital phase-locked loop and an analog phase-locked loop, that is, a dual-loop extraction scheme. The digital phase-locked loop mainly recovers a clock with jitter by using the timing error, and then further refines the recovered jitter clock by the analog phase-locked loop. The error of the traditional clock recovery scheme is one bit duration under the input code rate. The new scheme improved the error precision, thereby greatly reducing the clock jitter in the multi-relay transmission, which will be the key technology of the tropospheric scatter communication network.