The invention discloses a pseudo-classic architecture steel-frame structure with box type cross-section girders. The pseudo-classic architecture steel-frame structure comprises a slope roof, and frame columns are arranged under the slope roof; the frame columns comprise the first frame column and the second frame column which are arranged at the two ends under the slope roof, and a third frame column is further arranged in the position which is located between the first frame column and the second frame column and close to the second frame column; a main hall girder is arranged between the first frame column and the third frame column, and a slant hall girder is further arranged between the second frame column and the third frame column; the main hall girder and the slant hall girder are the box type cross-section steel girders, and the main hall girder is provided with a plurality of short columns; and the top ends of the short columns are connected to the slope roof through second bucket components. According to the pseudo-classic architecture steel-frame structure with the box type cross-section girders, construction is convenient, and the construction speed is high; all the main components can be transported to the site to be welded and connected after being manufactured and finished in a factory; the steel-frame structure system can meet special using requirements for pseudo-classic architectures, has good seismic performance and can be applied and popularized in the pseudo-classic architectures of high-intensity areas.