The thesis dealt with the determination of the influence of recycled wood on selected physical and mechanical properties of chipboards. We produced chipboards from spruce chips, chips from recycled mix and chips from recycled uncoated chipboard. Particleboards were made from recycled wood chips in various proportions to spruce chips, namely 0, 20, 50 and 100%. The control chipboard was made of spruce chips with 0% recycled wood. We assessed how the proportions of recycled wood affect the density, swelling (after 2 and 24 hours), absorbency (after 2 and 24 hours), tensile strength perpendicular to the plane of the board, flexural modulus and flexural strength of chipboards. 16 mm thick. The production as well as the determination of the properties of chipboards were performed in the premises of the development workshops of the Technical University in Zvolen. The aim of the work was to assess selected physical and mechanical properties depending on the proportion of recycled wood in the chipboard. We found a positive effect of the share of recycled wood in the chipboard on the physical properties (swelling and soaking after 2 hours and 24 hours), but also the adverse effect of all shares of recycled wood in the chipboard on the mechanical properties was confirmed.