The invention relates to a titanium alloy material, in particular to a multi-functional biomedical metastable beta titanium alloy material with excellent processing performance, and belongs to the technical field of titanium alloy material preparation. The alloy contains the following ingredients by mass: 18-27% of Nb, 0.5-2% of Mo, 3-5% of Zr, 7-9% of Sn, 0.1-0.3% of O and the balance of Ti. The titanium alloy has excellent comprehensive performance, and the strength and the elastic modulus of the alloy can be regulated through different thermal treatments. The elastic modulus E of the alloy is 40-7 3GPa, the yield strength sigma 0.2 is 260-864 MPa, the tensile strength sigma b is 686-1094 MPa, the elongation rate epsilon = 4-20%, and the facture surface shrinkage rate is 20-52%. The titanium alloy does not contain toxic elements, such as Al and V, and has excellent corrosion resistance, biocompatibility and cold processing performance. The titanium alloy can be used for manufacturing tissue repairing or substituting materials, such as artificial bones, artificial joints and bone plates.