Surface coating is an effective method for preventing corrosion of strand. This article investigates the influence of Magnesium Phosphate Cement (MPC) mortar coating on the bonding performance of strand. Central tensile tests were conducted by varying the grouting thickness of the cylindrical packaging surrounding the strand, in order to study the bonding performance of different thicknesses of MPC mortar on the strand tensile specimens, including the effect on failure mode and bonding strength. When compared to traditional adhesive coatings like epoxy resin and uncoated specimens, it has been observed that the bond strength of MPC mortar initially increases and then decreases as the coating thickness varies. Furthermore, when the coating thickness surpasses 15 mm, its bond strength outperforms that of specimens lacking adhesive coatings. The bond strength between MPC mortar and steel strands is superior to epoxy resin, with an average enhancement of approximately 40%. Typically, the ultimate pull-out load constitutes around 15% of the initial displacement pull-out load.