The invention provides a construction method for a support formwork integrated hydraulic inner formwork trolley of a comprehensive pipe gallery. The construction method comprises the following steps of surveying and setting out, pouring of a cushion layer, bricking and waterproof roll laying, mounting of base plate rebars, mounting of base plate formwork plates, mounting of the inner formwork trolley, mounting of embedded parts, formwork closing of the trolley, mounting of side wall and top plate rebars, concrete pouring, formwork removal of the trolley and moving of the trolley. According tothe construction method, dimensions of the support formwork integrated hydraulic inner formwork trolley are customized according to internal space dimensions of the pipe gallery; the support formworkintegrated hydraulic inner formwork trolley is composed of a walking system, a trolley frame, steel formwork plates, a formwork plate vertical and side-direction extending-and-contracting system, a hydraulic system and an electrical control system; the formwork plates are rapidly combined through rapid locating of the trolley and removed rapidly after pouring is completed; after pouring of a pipegallery main body is completed, locating of a subsequent pipe gallery main body can be completed by moving the trolley through the walking system; and after concrete pouring is completed, the surfaceis good in flatness and appearance quality, and good social benefits are achieved.