Support replacement system for post-cast strip and construction method thereof

The invention relates to a support replacement system for a post-cast strip and a construction method thereof, and relates to the field of equipment for engineering construction. The support replacement system comprises a foundation pit and support replacement devices arranged in the length direction at intervals. Each support replacement device comprises at least one support replacement segment and an adjusting segment, wherein one end of the support replacement segment is used for abutting against one side of the foundation pit, the adjusting segment comprises a movable end and an adjustingassembly, one end of the movable end is used for being connected to the end, away from the foundation pit, of the support replacement segment, the other end of the movable end is used for abutting against the other side of the foundation pit, the adjusting assembly is arranged at the movable end and used for adjusting the length of the movable end, a fixing assembly is arranged on the movable end,and the fixing assembly i