The invention relates to a suspension device on a built net frame steel ball. The suspension device is constituted by a hanging rod, a main keel, a double-layer lantern ring, steel wire ropes, an upper flange plate, a lower flange plate and a supporting plate; the double-layer lantern ring is formed by bending rigid materials and connected to supporting rods of the net frame steel ball in a sleeving mode; the upper ends and the lower ends of the steel wire ropes are locked and fixed into annular shapes through embracing hoops; one end of each of the upper flange plate and the lower flange plate is in a disc shape and is provided with a round hole, the other end of each of the upper flange plate and the lower flange plate is in a cylindrical shape, and a threaded hole is formed in the center of the other end of each of the upper flange plate and the lower flange plate; the upper ends of the multiple steel wire ropes are evenly connected into the double-layer lantern ring in a sleeved mode, and the two ends of connectors are fastened through clamping rings; the lower ends of the steel wire ropes are connected with the round hole in the upper flange plate; threads are arranged at theupper end and the lower end of the hanging rod and are in threaded connection with center holes of the upper flange plate and the lower flange plate through back tightening nuts correspondingly; and the I-shaped steel main keel is in threaded connection with the lower flange plate, and modular roof formworks are fixed to the main keel. The suspension device on the built net frame steel ball has the characteristics that the structure of the net frame steel ball is not damaged, the attractiveness of the net frame steel ball is not affected, force bearing is even, the loading amount is large, andsound insulation performance is good.