The invention provides a county adjustment setting method and device, and the method comprises the steps: obtaining a switching network topological graph in real time; visiting a target switching nodethrough a mobile agent; collecting the configuration protection information of all adjacent switching nodes; calculating the load importance of all adjacent switching nodes based on the configurationprotection information; increasing protection levels if the load importance is greater than a preset threshold, and correspondingly increasing the preset duration of cooperation time. The method provided by the invention is an extendable protection layer, can enable a protection boundary to extend towards a downstream side to an important user and to extends towards an upstream side to cooperatewith a transformer of a transformer substation, thereby forming a relatively fixed value which takes the transformer of the transformer substation as the reference. The setting rules are abundant, andthe method gives consideration to the power utilization demands of a user side, is suitable for the construction of an intelligent power distribution network, and solves problems that a conventionalpower distribution network has fewer protection setting rules, gives more consideration to the safety operation of a system side, and neglects the user side.