The invention provides a ceiling joist and double-layer construction platform integrated structure and a manufacturing method thereof. The ceiling joist and double-layer construction platform integrated structure comprises roof surface steel beams, upper layer platform suspension rods, upper layer platform beams, suspended ceiling suspension rods, suspended ceiling joists, lower layer platform suspension rods and lower layer platform beams, wherein scaffold boards are laid on all the upper layer platform beams and the lower layer platform beams to form double layers of construction platforms, suspended ceiling pipeline conduction is conducted by constructors on the upper layer platform, suspended ceiling board installation is conducted by constructors on the lower layer platform, and the construction on the upper layer platform and the lower layer platform are conducted at the same time; all members can be prefabricated in factories and assembled in site, and the manufacturing is simple; special connecting pieces are selected according to characters of each joint, materials of the members are selected according to load-bearing, the strength is guaranteed, and meanwhile the construction safety is guaranteed; the all-round scaffolds are not needed to be set up, the materials are saved, the space is saved, interruption to the lower attitude area can not be caused, the construction period is shortened, and the economic benefit is obvious; the ceiling joist and double-layer construction platform integrated structure can be used both as the suspended ceiling construction platforms and the suspended ceiling joists, only the lower layer platform suspension rods and the lower layer platform beams are needed to be detached after the suspended ceiling construction is finished, the practicability is high, and the ceiling joist and double-layer construction platform integrated structure is particularly suitable for the high-rise long-span suspended ceiling construction.