Polyurethane (PU) foam is one of the most important thermal insulation materials used in the construction industry and is the main insulation material used in the global appliances (refrigerators, freezers, etc.) industry. Nowadays, the synthesis of polymers from renewable resources, including polyurethane foams, has been actively investigated. In this work the potential application of BIOLIGNINTM (CIMV, France) as raw material for Lignopolyol (LP) synthesis, which is prospective for PU foam production is studied. In the same time non-modified lignin is used as non-reactive filler in rigid PU foams obtained from above mentioned LP. Goal of this work is substitution of petro-chemical raw materials in PU foams, and investigate thermal and physical-mechanical properties of lignin-filled foam materials. Liquid LPs were synthesized by oxypropylation method of air dried wheat straw lignin in high pressure laboratory scale reactor. In dependence of reaction conditions the hydroxyl value of LPs was in the range 355-455 mg KOH/g. The PU composition on the basis of commercial polyetherpolyols mix LUPRANOL 3300 (70%) and LUPRANOL 3422 (30%) with density 50 ± 5 kg/m3 was used as a reference sample. The complete substitution of 3-functional polyol LUPRANOL 3300 by LP doesn`t decline the PU foam`s physical – mechanical characteristics. At the same time the cell structure uniformity as well the dimensional and thermal stability of material were increased. In comparison with reference PU composition the lignin as filler can be incorporated in PU on LP basis foam in much more higher content without worsening of the physic - mechanical characteristics of material, in the same time improving it resistance to water absorption. In this work, the optimal lignin as renewable raw material content in PU foam composition reach 16%.