Relay protection device board card networking method and relay protection device

The invention relates to a relay protection device board card networking method and a relay protection device, and belongs to the technical field of relay protection. A management board card located in a mainframe box is connected with a non-management board card through a first exchange chip, a unique ID is distributed to each slot, each board card is inserted into the corresponding slot, the physical address of the board card is determined according to the ID of the slot, the management board card serves as a root node, the non-management board card serves as a downstream node, and the management board card and the non-management board card are connected. The downstream node acquires network card parameters of the management board cards and generates own network card parameters in combination with own physical addresses, and the root node generates corresponding routing entries, updates own routing tables, establishes networks among the nodes and realizes networking among the board cards. The method solves