Lightning protection device with telescopic function for steel structure building

The utility model discloses a lightning protection device with a telescopic function for a steel structure building, and aims to solve the technical problems that a lightning protection structure in a lightning protection device in the prior art cannot be used in a telescopic manner, and a supporting protection structure is lacked at the same time. The lightning protection device comprises a connecting bottom plate, a bottom placing module installed on the connecting bottom plate, and a lightning protection module connected to the bottom placing module and used for lightning protection. A telescopic module used for adjusting stretching and retracting is arranged in the lightning protection module, a side face supporting assembly used for protection supporting is arranged on the outer side of the telescopic module, and a reinforcing connecting assembly used for improving the overall stability is arranged on the outer side of the connecting bottom plate. A lifting hydraulic rod used for adjusting lifting is arr