The invention belongs to the technical field of aerospace crank transmission, and particularly relates to a crank bolt assembly used for aerospace. The crank bolt assembly comprises a crank bolt, a long-rod double-head nut, head blocking bolts, a crank transmission rotating plate and rolling bearings. The crank bolt comprises a threaded rod and a head blocking plate. A front external thread and a rear external thread are arranged on the outer wall of the threaded rod. A front bearing groove and a rear bearing groove are formed in the two ends of the threaded rod along the inner wall of the threaded rod. An external connection gear groove is formed along the inner wall of the head blocking plate. The long-rod double-head nut comprises a force-bearing rod part. Internal threads are arranged at the two ends of the force-bearing rod part. Each head blocking bolt comprises a head blocking threaded rod and a pulling and screwing head part. External threads matched with the internal threads are arranged on the outer walls of the head threaded rods. The crank transmission rotating plate comprises a transmission rotating plate body. An internal connection gear groove is formed in the side wall of the transmission rotating plate body. The internal connection gear groove can be engaged with the external connection gear groove. The invention further relates to a method for conducting transmission through the crank bolt assembly.