Among these products, the thermopressed straw-based thermal insulation boards are paid much more attention due to its simple and efficient production process. However, it still takes longtime to prepare thick insulation materials by means of traditional platen-pressing process. To further improve production efficiency,a new process for manufacturing insulation materials from rice straw using high frequency hot-pressing is developed in this study and the effect of high frequency heating, board density, particle size and ambient temperature on the properties of rice straw insulation materials are investigated.