Seamless connection system for assembled steel structure beam-column member and floor bearing plate and construction method

The invention relates to a seamless connection system for an assembled steel structure beam-column member and a floor bearing plate and a construction method. The seamless connection system comprisesa prefabricated steel bar truss deck, a steel I-beam, an upper chord connecting reinforcement, a lower chord connecting reinforcement, additional reinforcements, a column-side connection profile steelpart and a profile steel column, wherein the steel I-beam is fixed to a lower part of the steel bar truss deck; the upper and lower chord connecting reinforcements are arranged on an upper part and alower part of the steel bar truss deck respectively; the additional reinforcements are arranged on the top and at the bottom of the steel bar truss deck respectively; the column-side connection profile steel part is connected with the steel bar truss deck; the profile steel column is welded together with the column-side connection profile steel part; the steel bar truss deck comprises a bottom die steel plate and a plurali