The invention discloses a network link performance data mutual-aid collecting method based on a sharing monitoring node. Adopted equipment comprises a protocol server, an issuing server, a storage server and the monitoring node. The method comprises the steps of joining in a monitoring network for mutually aiding collecting of network link performance data, mutually aiding collecting of network link performance data, and collecting data by use of a mutual-aid collecting network. Through adoption of the method, users do not need to purchase a lot of hardware to deploy a node network, and the few nodes monitored by all members are shared, so as to form a low cost monitoring node network, the monitoring nodes of which can increase automatically.