Lightning protection power secondary system

The utility model relates to a power system protection technology and particularly discloses a lightning protection power secondary system, which comprises a load served as secondary equipment. A power supply driving module is arranged between the load and a power supply device served as primary equipment. The lightning protection power secondary system also comprises two stages of lightning protection circuits, wherein a first-stage lightning protection circuit is connected between the input end and the lightning-proof grounding end of the power supply driving module and a second-stage lightning protection circuit is connected between the output end and the lightning-proof grounding end of the power supply driving module. Due to the arrangement of the two stages of lightning protection circuits, most of the lightning current is released through the first-stage lightning protection circuit arranged at the input end of the power supply driving module. Meanwhile, the residual voltage applied across the load is reduced through the second-stage lightning protection circuit arranged at the output end of the power supply driving module. Thus, the load is prevented from suffering the lightning strike and the safety of the load is improved. The service life of the load is therefore prolonged.