Steel column drum rack support type hydraulic lifting overall steel platform cross truss layer construction method

The invention provides a steel column drum rack support type hydraulic lifting overall steel platform cross truss layer construction method. A steel column drum rack support type hydraulic lifting overall steel platform comprises a steel platform system and a support system. The support system comprises a drum rack support and a steel column support. The steel platform system comprises a plurality of steel platform units and connecting beams. The steel platform units are connected into an overall steel platform through the connecting beams. A steel cover plate is disposed on the overall steel platform to form a construction platform. The drum rack support is fixed blow the overall steel platform. The steel column support is located at the upper end of a core drum concrete structure. The method includes: removing the steel cover plate and the connecting beams interfered with a truss layer step by step, hanging all truss layer rod components into the core drum through holes step by step, remounting the removed steel cover plate and the connecting beams when each step of hanging is completed, connecting the truss layer components, and allowing the components to be fixedly connected with the core drum so as to form the truss layer. By the method, safe construction is guaranteed effectively, and construction period is shortened.