Medium-high frequency composite waveguide horn device and sound box

The invention belongs to the technical field of sound equipment, and particularly relates to a medium-high frequency composite waveguide horn device which comprises a high-frequency composite waveguide mechanism and medium-frequency compression waveguide mechanisms symmetrically arranged on the two sides of the high-frequency composite waveguide mechanism. The high-frequency composite waveguide mechanism comprises a sound amplification waveguide and a tweeter; the sound amplification waveguide is provided with at least two sound amplification cavities in a penetrating manner, two ends of each sound amplification cavity respectively form a sound outlet and a sound inlet at the front end and the rear end of the sound amplification waveguide, and the sound amplification cavities are gradually enlarged from one end of the sound inlet to one end of the sound outlet; sound inlets of the two sound amplification cavities are respectively provided with a tweeter; the intermediate-frequency compression waveguide mechan