The invention relates to a building project construction method. The building project construction method comprises the steps of measuring, paying off, construction of a pile foundation, construction of a foundation pit support, earthwork excavation, construction of a foundation under layer, bottom plate water prevention construction, construction of a basement formwork, binding of basement reinforced bars, basement concrete construction, basement external wall water prevention, segmental inspection and acceptance of subgrade and the foundation, earthwork backfilling, construction of a body structure, wall body laying, segmental inspection and acceptance of a main body, wall body plastering, external wall heat insulation, dry hanging of stones, constructions of wall face bricks, construction of building floor tiles, construction of laying of hardwood floors of a building floor, construction of building floor carpets, wall face emulsion paint coating, mounting of doors and windows, segmental inspection and acceptance of finishing and decorating, roof leveling blanket construction, roof slope construction, roof heat insulation layer construction, roof waterproof layer construction, construction of a polyvinyl chloride plastic thin film insulation layer, roof rigid layer construction, roof segmental inspection and acceptance, project pre-inspection and acceptance and project final inspection and acceptance. The construction steps are precise, the automation degree is high, and the construction efficiency is high.