The invention relates to a leather cloth cleaning and maintaining agent and a preparation method thereof. The cleaning and maintaining agent comprises components in parts by mass as follows: 4-10 parts of sodium alcohol ether sulphate, 0.8-3.5 parts of nonylphenol polyoxyethylene ether, 1-5 parts of ammonium hydroxide, 3-8 parts of ethyl alcohol, 6-15 parts of palm oil, 0.5-1.5 parts of hydroxypropyl methyl cellulose, 0.6-1.4 parts of sodium phosphate, 2.5-8 parts of isopropyl palmitate, 1-3.5 parts of ethylene glycol monobutyl ether, 0.6-1.5 parts of triethanolamine, 13-28 parts of white mineral oil, 0.06-0.15 part of phenol and 40-65 parts of deionized water. The invention provides the leather cloth cleaning and maintaining agent and the preparation method thereof. The cleaning and maintaining agent has good cleaning, maintaining, mildew-proof and seasoning functions, and the luster and the softness of leather cloth are enhanced.