Abstract: The effects of laser surface remelting (LSR) on the properties of medical heat treated Mg-1Mn-2Zn alloy were studied by X-ray diffraction (XRD), electron backscatter diffraction (EBSD), sliding wear and electrochemical corrosion experiments. The results show that after LSR treatment, the grain size of the alloy was significantly refined, with the average grain size decreasing from 63.7 μm to 6.45 μm, and the dislocation density increasing. Compared with the original samples, the LSR treatment significantly improved the hardness and wear resistance of the alloy, with the wear rate decreasing from 8.6 mg·mm⁻¹·N⁻¹ to 2.2 mg·mm⁻¹·N⁻¹. In addition, the corrosion rate was significantly reduced from 4.59 mm/y to 0.064 mm/y, showing excellent corrosion resistance. It is shown that LSR treatment provides an effective way to improve the mechanical properties and corrosion resistance of medical magnesium alloys.