The invention discloses a tin alloy membrane electrode and an application thereof. The tin alloy membrane electrode is prepared by the following steps: (1) preparing chemical plating solution by using thiourea, citric acid, sodium hypophosphite, concentrated sulfuric acid, stannous sulfate, nitrate of metal M and water, wherein the metal M is Ag, Fe, Ni, Co, Zn, Al, Mg or Cu; a pH (Potential Of Hydrogen) value of the chemical plating solution is in a range of 0.8-1.1, the concentration of the thiourea is 40-200g / L, the concentration of the citric acid is 20-80g / L, the concentration of the sodium hypophosphite is 30-160g / L, the concentration of the stannous sulfate is 0.1-0.4mol / L, and the concentration of the nitrate of the metal M is 0.1-1g / L; (2) corroding a copper foil by using sulfuric acid with the concentration of 0.3-0.6mol / L for 10-15 minutes, and then washing and drying by distilled water; and (3) placing the corroded copper foil in the chemical plating solution with the temperature kept within a range of 30-40 DEG C, and reacting for 30-120s; forming a tin alloy membrane on the surface of the copper foil; and drying to obtain the tin alloy membrane electrode. The invention further provides an application of the tin alloy membrane electrode as a cathode of a lithium ion battery, and has the advantages of high capacity and stable properties.