The invention provides a suspension bridge long suspension cable auxiliary device and a manufacturing and using method thereof. The suspension bridge long suspension cable auxiliary device comprises pieces of structural steel, a first bearing plate, middle rollers, side rollers, a second bearing plate, bearings and clamping groove steel plates and is characterized in that the first bearing plate and the second bearing are in parallel, the one or more middle rollers are mounted on the inner sides of the first bearing plate and the second bearing plate and connected with the first bearing plateand the second bearing plate through the bearings, and the clamping groove steel plates are longitudinally mounted at the two ends of the lower portions of the first bearing plate and the second bearing plate and perpendicularly intersect with the first bearing plate and the second bearing plate. The outer sides of the first bearing plate and the second bearing plate are each connected with the corresponding piece of structural steel, and the pieces of structural steel are connected with the clamping groove steel plates. The side rollers are arranged between one ends or two ends of the two pieces of structural steel, or the side rollers are arranged one ends or the two ends of the first bearing plate and the second bearing plate. According to the suspension bridge long suspension cable auxiliary device and the manufacturing and using method thereof, the mounting difficulty is reduced, the mounting efficiency is improved, the technique feasibility is good, and the economic benefits areremarkable.