The invention discloses a high-efficiency composite converter lower suspension connection system. The high-efficiency composite converter lower suspension connection system comprises coupling wheels,balance seats, a supporting column, a workbench, a working chamber, a limiting block, a guide rail, a middle shaft sliding rail, a trolley, a gyroscope, sliding blocks, a stretcher, a transmission, areduction wheel, a hanging arm, a connecting wheel and a converter, wherein the reduction wheel is fixedly connected with the connecting wheel through the hanging arm; the lower end of the connectingwheel is fixedly connected with the converter; the guide rail is slidably connected with the stretcher; the sliding blocks are embedded in the two ends of the stretcher; and the right side of the stretcher is fixedly connected with the transmission. According to the high-efficiency composite type converter lower suspension connection system, the structure bearing is improved accurately through a reasonable structure, the stability and reliability of operation of lower suspension connection are further enhanced, it can be ensured that the converter is controlled reliably by high-efficiency composite shaft symmetric structures distributed on the two sides of the workbench, the lower suspension connection system can be powered off in time when accidents occur, and a certain protection effectcan further be achieved.