A medical porous tantalum material for dental bone replacement and preparation method therefor, produced as follows: mixing tantalum powder, polyvinyl alcohol, and sodium bicarbonate into a powder mixture, press-forming the powder mixture into an organic foamed body, then degreasing, sintering, cooling, and performing a heating process. The pressure used during the press-forming is 50 to 100 Mpa. The diameter of the produced medical porous tantalum material pores is 30 to 50 μm. The porosity is 30% to 38%. The porous tantalum method of the present invention uses a purely physical molding method, so that the final porous tantalum material contains low concentration of impurities, thereby effectively enhancing the biocompatibility and biosafety. Measurements show that the impurity concentration is lower than 0.2%. The density reaches 10.34 to 11.67 g/cm3, the porosity reaches 30% to 38%, and the pore diameter reaches 30 to 50 μm. The elastic modulus reaches 4.5 to 6.0 Gpa, the bending strength reaches 120 to 130 Mpa, and the compressive strength reaches 100 to 140 Mpa. The porous tantalum of the present invention is applicable as a medical implant material for dental bone replacement.Matériau en titane poreux de substitution dos dentaire à usage médical et son procédé de préparation. Ce matériau est formé de poudre de tantale et dun mélange de poudre synthétique dalcool polyvinylique et de bicarbonate de sodium. La poudre synthétique est comprimée jusquà obtention, dans un corps mousseux organique, dun moulage, décrassage, frittage, refroidissement et traitement thermique, le moulage par compression nécessitant une pression comprise entre 50 et 100 MPa, le diamètre des pores du matériau de tantale poreux à usage médical étant de 30 à 50 μm et la porosité allant de 30 à 38 %. Le procédé de préparation de tantale poreux de cette invention met en oeuvre un procédé de moulage purement physique de telle sorte que le matériau de tantale poreux final contienne une faible ten
