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The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi-walled carbon nanotubes (MWCNT), both functionalized and non-functionalized, were investigated. In order to obtain the solid-state bulk CNM from the ultradispersed aqueous solutions of 25 wt.% BSA and (0.0015 - 0.04) wt.% MWCNT, the methods of nanotechnology and laser technology were used. It is revealed that the CNM density is 10% - 20% higher than that of water and the hardness is higher than that of BSA by a factor of 3 - 6 times. An increase in hardness <i>H_v</i> (by Vickers) of CNM correlated with an increase in the concentration of MWCNT, and <i>H_y</i>reached ~300 MPa for the case of the non-functionalized MWCNT, while for the case of the functionalized MWCNT, <i>i.e.</i> MWCNT_f, <i>H_y</i> was 25% lower