The invention discloses a device for maintaining a compression arm on a satellite solar array, and particularly relates to the technical field of aerospace equipment parts. The device comprises a mechanical arm, wherein a power box and a positioning cylinder are arranged on the mechanical arm, a transmission mechanism, first transmission shafts and a second transmission shaft are arranged in the power box, a telescopic mechanism is connected to each first transmission shaft, and an inner hexagon wrench is connected to each telescopic mechanism; the second transmission shaft is provided with acasing and a first spring, the first spring is fixed on the second transmission shaft, the first spring covers a holder, the inner wall of the holder is provided with a compression arm wrench, a nut wrench, a compression arm lift and a photoelectric switch. The compression arm lift is positioned between the compression arm wrench and the nut wrench, and a first proximity switch and a snap ring arearranged in the positioning cylinder, and a second proximity switch is disposed on the positioning cylinder. The technical solution of the invention overcomes the problem of unlocking failure of thecompression arm on the satellite solar array, and the device can be used for maintenance of the solar array on the satellite.