The work aims to prepare a new electroplating additive to obtain a white bright copper-tin alloy electroplated coating with comprehensive properties. The electrolyte was composed of K4P2O7?3H2O of 250 g/L, Cu2P2O7?3H2O of 16 g/L and Sn2P2O7 of 12 g/L. The electroplating was conducted in the above electrolyte (pH = 8.5) at ambient temperature and current density of 0.3 A/dm2 for 5 min. An orthogonal experiment was designed to determine the optimal formula of the electroplating additive, and the 60° gloss of coating was used as a criterion. The adhesion, surface hardness, friction coefficient and corrosion resistance of the coating prepared by the optimal formula were analyzed by cross-cut tester, vickers hardness tester, surface performance tester and salt spray device. The surface morphology and phase were analyzed by SEM and XRD. An optimal formula of additive selected by the orthogonal experiment was composed of SPS of 0.008 g/L, PN of 0.008 g/L and M of 0.0008 g/L. The white bright Hull cell test samples were prepared by the additive formula under the above electrolyte and process conditions. The gloss of the coating at 60° reached 269.7. The electroplated coating showed a smooth surface with adhesion level of ISO grade 2. Vickers hardness of the electroplated coating was 154.47HV0.2, and the friction coefficient was 0.2. The electroplated coating was free from corrosion after the salt spray test for 72 hours. The obtained additive can be used to prepare a bright silvery electroplated coating with high glossiness. The coating has good bonding force, high hardness, and good abrasion resistance and corrosion resistance. The properties of the prepared coating can meet the requirements of industry. The coating surface is smooth and the phase is Cu6Sn5 and Cu13.7Sn.