The work aims to prepare industrial hemp/polylactic acid fiber composites by wet method with industrial hemp fiber (PLA) and polylactic acid fiber (HF) as raw materials, and explore the mechanical properties and sound absorption properties of the composites. Industrial hemp fiber/polylactic acid fiber composites with different mass ratios (8∶2, 7∶3, 6∶4, 5∶5) were prepared by non-woven and hot pressing wet method. The structure and properties of the materials were tested to explore the effects of polylactic acid fiber on the mechanical properties and sound absorption properties of industrial hemp fiber. With the increase of the mass ratio of polylactic acid fiber, the mechanical properties of the material were gradually enhanced. Among them, the mass ratio of 5∶5 resulted the best mechanical properties. The more polylactic acid fiber, the lower the sound absorption coefficient of the material, and the mass ratio of 8∶2 resulted the best sound absorption property. Industrial hemp/polylactic acid fiber composites have good sound absorption and mechanical properties.