A flexible display substrate, a flexible display device, and a method for repairing the same are disclosed in embodiments of the disclosure, all belonging to a technical field of display. The flexible display substrate comprises: an underlying substrate; and a plurality of flexible structure assemblies provided on the underlying substrate, each of which is electrically conductive; at least one of the plurality of flexible structure assemblies comprises at least one repairing layer formed by a first conductive material which is repairable and at least one circuit device layer formed by a second conductive material, the circuit device layer and the repairing layer being provided to overlap with each other.