The invention discloses a construction method for an entrance open excavation inverted well wall. The method comprises the following steps: S1) firstly excavating a vertical shaft close to one side of underground excavation, finishing a lining structure after the vertical shaft reaches the bottomand reserving post-cast strip joints for two construction joints; S2) excavating an adjacent vertical shaft, constructing a secondary lining structure after the vertical shaft reaches the bottom and reserving post-cast strip joints for two construction joints; S3) lastly removing the well wall between the vertical shaft S1 and the vertical shaft S2, pouring and then pouring a post-cast strip top plate sidewall structure. The construction method solves the problem that the traditional station entrance/exit open excavation sections occupy large area, occupy municipal administration path and are easy to cause serious traffic jam; the disassembling and reforming fees at early stage are lowered; the problems of difficulties in placing and construction of construction equipment caused by insufficient area are solved; the disturbance to the peripheral buildings and soil layers is reduced; the safety of the peripheral buildings and underground pipelines is ensured.