The invention discloses a large-size pipe jacking sunk well reverse construction method based on a limited space. The method comprises the following steps: flattening a field to be constructed; according to design requirements, confirming a ground position of a sunk well to be excavated; according to a surveying and setting out position, carrying out sunk fender post construction; digging off soilon the ground surface; rechecking the space position of an excavation space; constructing a first section of reinforced concrete structure of the sunk well; after the first section of the structure is constructed, carrying out earth excavation construction on the sunk well; constructing concrete structures on a south side and a north side of the sunk well; digging off earth within a structure range of a second section of the sunk well; constructing concrete structures on the east side and the west side of the sunk well; and after a second section of the east and west structure is constructed,constructing later sections of the sunk well, and carrying out sunk well bottom sealing construction. By adopting the method, ground surface and surrounding structure deformation, foundation pit excavation and main body structure cross construction are effectively controlled, the load of a reverse structure self is directly conducted to a foundation from a vertical column, meanwhile, the influence of excavation unloading upon a bearing stratum is reduced, the construction security is improved, and meanwhile, environment protection can be facilitated.