The invention provides a method and device for restraining packet network PDV (Packet Delay Variation) noise and slave clock equipment, and relates to the technical field of packet networks. The method comprises the following steps: taming a local rubidium atomic clock according to a GNSS (Global Navigation Satellite System) satellite signal, determining the fixed time error of a PTP (Precision Time Protocol) time signal receiving interface, and performing fixed time delay error correction on PTP data packets; acquiring the corrected PTP data packets; selecting a target PTP data packet according to one or more of ITU-TG.8261 packet selection algorithms and the design parameter of each algorithm; determining a synchronization stability index corresponding to one or more algorithms; judging whether or not the synchronization stability index satisfy a preset threshold condition; when the synchronization stability index satisfy the threshold condition, performing time and frequency signal recovery processing on the target PTP data packet, and outputting a frequency signal and a PTP time signal to finish the deployment processing of a slave clock equipment node; and when the synchronization stability index does not satisfy the threshold condition, dynamically adjusting the design parameter, and returning a reselected target PTP data packet.