The work aims to improve abrasion resistance of magnesium metal by self-assembling MPTs monolayers on the surface of magnesium metal. It was immersed in a solvent to prepare self-assembled monolayer solution with MPTS as self-assembled solute by taking advantage of self-assembled monolayer technology, and then was adsorbed on the surface of magnesium substrate. Morphology and film thickness range of MPTS monolayer formed on the surface of magnesium metal were tested by using scanning electron microscope (SEM) and auto ellipsometer and analyzed in details. With the extension of the self-assembly duration, the film compactness increased gradually and the mechanical performance improved significantly. When the reaction time was 5 min, MPTS assembly was in the initial film growth stage and film was relatively loose and porous. At this moment, self-assembled film had no sustained release effect. When the reaction time extended to 60~80 min, the reaction was gradually complete. When film formation time reached 80 min, the compact, orderly and even MPTS self-assembled monolayer formed on the surface of magnesium metal. A film layer of excellent performance forms on the surface of magnesium metal in virtue of self-assembled monolayer technology. With the extension of self-assembly duration, compactness of the film increases gradually, abrasion resistance further improves, and the film is stressed uniformly.