AbstractResearches aim to significantly increase the operational properties of the wood materials without compromising on their environmental significance. The possibility of implementing a fundamentally new approach involving filling the free space in the wood fiber structure with such mineral filler particles as nanosized basalt is shown. The research focuses on solving problems concerned with the optimal quantitative ratio selection for the fine mineral components of wood composite, working out the mineral reinforced material prototypes and testing their hydrophysical and fire-technical properties. The proposed method of highly dispersed wood material reinforcing with basalt nanoparticles allows getting highly water- and heat-resistant as well as eco-friendly raw materials. The composite reinforced with wood fiber is characterized by the decreased level of water absorption values and the significantly reduced smoke emission coefficient.