The invention discloses a high-performance magnetic liquid sealing structure, and belongs to magnetic liquid rotary sealing. The high-performance magnetic liquid sealing structure is suitable for conveying high-pressure medium gas at high speed. The sealing structure is composed of a magnetic conductive shaft, a first pole shoe, a second pole shoe, a third pole shoe, a permanent magnet, a sealing seat, an outer hexagonal bolt, a gland, a comb tooth sealing shell, a rolling bearing, a locking thread cover, an inner sleeve shell, an inner gland, a sealing ring and the like. When the pressure of sealed medium gas is high, a magnetic liquid seal needs to be set in multiple stages, thus the space structure is greatly limited, and the defect that the space size of the magnetic liquid seal is limited is overcome. A comb tooth seal is added to the rear end of the magnetic liquid seal, high-pressure air is introduced into a cavity of the comb tooth seal, air pressure balance between the cavity of the comb tooth seal and the interior of a medium end cavity is achieved, the sealing medium is fully sealed, and the sealing space size is saved.