Hollow-wall winding pipe capable of being replaced online

The invention relates to the field of pipes, in particular to an online replaceable hollow wall winding pipe which comprises a winding pipe body, a synchronous replacement mechanism and a widening mechanism. The number of the winding pipe bodies is two, and the two winding pipe bodies communicate with each other through the synchronous replacement mechanism. The synchronous replacement mechanism comprises an upper sealing plate, a rectangular frame and a lower sealing plate which are sequentially arranged from top to bottom; two semicircular limiting plates are arranged in the rectangular frame in a mirroring sliding mode, and plugging plates are arranged on the two sides of each semicircular limiting plate; two U-shaped plates are arranged between the upper sealing plate and the lower sealing plate in a mirroring sliding mode, two mounting holes are formed in each U-shaped plate, and a pipeline connector used for being connected with a winding pipe body is arranged in each mounting hole; the widening mechani