The addition of Mn to Ti has been extensively investigated due to the remarkable biocompatibility and strength of Ti-Mn alloys, but their ductility was to prove insufficient, particularly for the powder metallurgy technology. In this study, Ti-2Mn, Ti-2Mn-2Sn, Ti-4Mn, and Ti-4Mn-2Sn alloys were manufactured by the powder metallurgy. The impact of slight Sn on the sintering densification, microstructure, mechanical properties, and electrochemical behavior of the Ti-(2–4 wt%) Mn alloys was researched. The findings indicate that a tiny amount of Sn effectively decreased the alloy's melting point, ideal sintering temperature, and sintering time. The addition of Sn didn't transform the lamellar structure of Ti-Mn alloy. In term of Ti-2Mn, Sn favoured the compressibility, played a beneficial effect in encouraging densification and refined the size of α and β phases. The ductility was significantly enhanced (15.9%), strength kept excellent (784 MPa) and corrosion resistance was improved, yielding in achieving a synergistic increase in strength, ductility and corrosion resistance. However, the addition of Sn in Ti-4Mn alloy hindered densification and promoted β phase coarsening, leading to little boost in ductility and deterioration of the corrosion resistance. Those findings could offer new insights to invent low-cost Ti alloys with wonderful performance.