The invention belongs to the field of structural design and construction and particularly relates to a super-long floor concrete post-pouring seam design and construction process. The design and construction process mainly includes the following steps of 1, determining of a beam and slab post-pouring seam sideline; 2, mounting of a beam slab panel; 3, determining of a beam and slab unbonded rebar area; 4, binding of beam steel and filling of a beam post-pouring seam; 5, binding of slab steel and filling of a slab post-pouring seam; 6, pouring of beam and slab concrete; 7, curing of the concrete; 8, pouring of the post-pouring seams; 9, curing of the post-pouring seams. According to the super-long floor concrete post-pouring seam design and construction process, sufficient extension strain capacity of a post-pouring seam unbonded rebar is scientifically utilized, the purpose of releasing temperature stress of floor concrete is achieved, and it is guaranteed that a super-long floor is free of cracking. Compared with a traditional post-pouring belt construction method, phenomena of cracking of floors on the two sides of a post-pouring belt and rebar corrosion are avoided, construction operation is simple, the construction period is greatly shortened, comprehensive cost is greatly saved, remarkable economic and social benefits are achieved, and the design and construction process meets construction requirement of high efficiency, energy conservation and environmentally-friendliness.