The invention provides an integrated station structure adopting a middle cover-excavation method, and a construction method. An underground continuous wall in an original envelope structure and a mainbody side wall in an original main body structure are replaced by an integrated thickened envelope-structure continuous wall, and a second cross support located below the S1 steel support in a construction process is replaced by a poured main-body-structure concrete middle plate; and moreover, the main-body-structure concrete middle plate, a station main-body-structure bottom plate located at thebottom, and a main-body-structure concrete top plate located at the top are connected to and act on the envelope-structure continuous wall, a part above the concrete middle plate is constructed through an open-excavation method, and a part below the concrete middle plate is constructed through a cover-excavation method. According to the integrated station structure adopting the middle cover-excavation method, and the construction method, a part of support replacement procedures are saved; and due to the integration of an envelope and a main body structure, the structure is further optimized,so that the rigidity of the envelope and the main body structure is increased, and the problem of structure instability brought by support detachment replacement is reduced.