Construction method for flat-top subway station node trolley with columns

The invention discloses a flat-top column-equipped subway station node trolley construction method, which comprises a subway station structure and a trolley, the subway station structure comprises a bottom plate, a top plate, a side wall, a middle beam and a middle column, the bottom plate, the side wall, the middle beam and the middle column are in fabricated connection, and the bottom plate and the middle column are in pouring connection; the trolleys comprise two bottom trolleys, a top trolley and a middle stand column trolley, and the two bottom trolleys are arranged in the space defined by the middle beam, the side walls and the bottom plate respectively. The construction method is suitable for the flat-top columnar rectangular assembly type local node cast-in-place assembly type subway station and high in practicability, a streamlined operation mode is adopted, the lower side wall, the middle plate and the middle lead screw can be assembled at a time, horizontal supporting force is provided for an enclo