The utility model discloses a space ultra-large type opening/closing roof track system. The space ultra-large type opening/closing roof track system comprises a track beam assembly, a track assembly, an upper car bumper and a lower car bumper, wherein the track beam assembly is connected with a fixed roof by a track beam support; the track assembly is fixedly arranged on the top face of the track beam assembly by a bolt and a pressing block; the lower car bumper is arranged on an opening stopping position of a movable roof; the upper car bumper is arranged on a closing stopping position of the movable roof; the upper car bumper and the lower car bumper are connected with the top face of the track beam assembly. A design method comprises the following steps: extracting a track beam load; selecting a typical opening/closing state to analyze according to a whole calculation model; extracting an acting force under each state and comparing; and extracting the worst acting force to be used as a designed load of a post-period track beam and a track beam support. According to the space ultra-large type opening/closing roof track system, the track system and a mechanical system form a good match; the enough safety and the smaller deformation are realized; the stability of the opening/closing process of the roof is guaranteed; the unbalanced load of the mechanical system and the abrasion of the system are reduced; the maintenance cost of the opening/closing roof is reduced.