The paper presents the results of studies of the process of wood pellets pressing. The change in the modulus of longitudinal elasticity (Young's modulus) at different pressures depending on heating temperature, humidity and fractional composition of sawdust (charge) is considered. In previous studies, the dependences of the elastic modulus on external factors for chipboard and fiberboard made of crushed wood particles with a binder are defined. In the works of various authors there are separate data on the dependence of the magnitude of the final density and quality of compressed granules on the Young's modulus of compressed wood mixture in the channels of cylindrical matrix. At the same time, questions about the effect of pressing pressure as a function of temperature, humidity and fractional composition of chips on the magnitude of the modulus of the longitudinal elasticity of a compressed wood mixture without binders have not been studied sufficiently. An experimental setup has been created to determine the elastic modulus of compressed wood mixture. The model of the deformation compression of the wood charge in the filler of a cylindrical matrix has been chosen as the basic scheme for conducting experiments. An experimental determination of the modulus of longitudinal elasticity has been performed for the mixture of spruce, pine and birch wood of various fractions. The pressing force of the charge has varied from 100 to 300 kgf. As a result of the study, it was established that the dependence of the elastic modulus of wood pellets on the pressing force is linear one; for compressed wood mixture at operating pressures of 100-300 kgf in the press granulator, the Young's modulus varies within 600 -1500 MPa; pressing temperature has a significant impact on the magnitude of the elastic modulus at values up to 100-102 ºС, a further increase in temperature does not make significant changes; when pressing the wood charge, predominantly elastic deformations occur; the change in the fractional composition and moisture content of the wood mixture affects the Young's modulus to a lesser extent than the temperature; the quality of wood pellets decreases when the moisture content of wood mixture is 6 % or less.