Objective To study the hot-press preparation process of environmental packaging material and evaluate the performance of the material. Methods Water hyacinth was used as the raw biomass material in this study. The fibers were cracked, processed by hot water, supplemented with additives, and the environmental packaging material was finally prepared by hot-press. Using the formulation of additives, the temperature and the pressure of hot-press as influencing factors, orthogonal experiments were conducted. After the preparation, the dimensional stability, mechanical performance and water resistance were selected as indicators to test and evaluate the performance of the material. Results The results showed that using 0. 8% sodium alginate as adhesive, 2% urea as plasticizer,1% emulsion paraffin as water proof agent, the biomass packaging material prepared at 130 ℃ and under 10 MPa pressure had good comprehensive performance. Conclusion Biomass packaging material with good performance was prepared using hot-press technology in combination with the addition of environment-friendly additives.