The invention discloses an HIFI sound box system, which relates to the technical field of loudspeakers, and comprises a shell, a bass loudspeaker unit, an alto loudspeaker unit, a high pitch loudspeaker unit, a natural air suction port, an inverted sound outlet hole or a radiator, a suspension edge connected with the radiator, and a dynamic following assembly connected with the suspension edge. According to the invention, the bass loudspeaker unit pushes air in the shell, after the air in the shell is thinned, the bass loudspeaker unit sucks air from the outside through the natural air suctionport to supplement the air in the shell through the characteristic that the bass loudspeaker unit plays sound at intervals, so that the bass loudspeaker unit can push more air in the shell, and the playback effect of the HIFI sound box is enhanced. When the radiator is adopted to adjust the tone quality of the bass loudspeaker unit, the position of the bass loudspeaker unit changes after the bassloudspeaker unit vibrates and moves along with the radiator through the dynamic following assembly, radiation wave reflection waves generated by the radiator are prevented from being blocked and applied to the radiator, and the HIFI loudspeaker box replay effect can be enhanced.