The work aims to study the preparation process and parameters of outer packaging box materials, in order to improve the utilization rate of Chinese agricultural and forestry surplus resources, and solve the urgent need of Chinese green packaging materials market. The composite board for outer packaging was prepared by hot pressing method with rice husk and wood residue shavings as the main raw materials and PF and PAPI as the adhesive. The WCAMA six-cycle aging method was adopted to process the test piece. Then, macro analysis for mechanical properties such as IB, MOR, MOE and micro analysis for changes in material composition were conducted to the composite board after ageing process. When surface sizing amount was 8%, core sizing amount was 11%, density was 0.9 g/cm3 and waterproofing agent content was 0.6%, the retention rate of composite board’s IB, MOR and MOE was above 50% and the composite board had good aging resistance. The preparation process and component parameters based on aging performance can provide theoretical and practical support for the development of rice husk-wood shavings outer packaging box materials in green, environmentally friendly, and economically sustainable aspects.