The invention relates to a backup method and device applied to automatic power supply recovery of an intelligent distributed feeding line. The method comprises the following steps of performing power supply recovery by the automatic and intelligent distributed feeding line system; and judging whether single-side voltage-loss delay switch-on is needed to be performed on a switch in the automatic and intelligent distributed feeding line system or not, if yes, performing single-side voltage-loss delay switch-on on the switch in the automatic and intelligent distributed feeding line system and completing power supply recovery of a non-fault region, otherwise returning to judge again. The device comprises a single-side voltage-loss delay switch-on judgment module and a single-side voltage-loss delay switch-on execution module, wherein the single-side voltage-loss delay switch-on judgment module is used for judging whether single-side voltage-loss delay switch-on is needed to be performed on the switch of the intelligent distributed feeding line system, and the single-side voltage-loss delay switch-on execution module is used for controlling the single-side voltage-loss delay switch-on to be performed on the switch of the intelligent distributed feeding line system. Compared with the prior art, the backup method and device has the advantages of high automatic degree and the like, power supply recovery is guaranteed, and the backup device is simple and convenient to operate.