The invention relates to a method and device for measuring the properties of earth materials subjected to a load, the device comprising a cylinder (10) for a material sample enclosed by a cover and bottom plate (6a, 7a), compressing the sample, and making the central axes of the cover and bottom plate deviate parallel to each other by an angle in relation to the central axis of the cylinder and in the same plane with the central axis of the cylinder. The central axes of the cover and bottom plate revolve about the central axis of the cylinder (10) with an angular deviation so as to deform the sample. In order to make the measuring more effective the material is measured by means of a device which is provided for measuring the force resisting the deformation of the sample in the direction of the radius of the sample, and for measuring the force resisting the deformation of the sample in the direction of rotation of the angular deviation.