The invention relates to a metal surface silanization treatment agent and a metal surface silanization treatment method using the same, and in particular relates to a non-phosphorus metal surface treatment method which replaces or partially replaces the traditional zinc phosphorization and iron phosphorization process. The metal surface silanization treatment agent comprises organosilane, organic acid, alcohol, a promoter and deionized water; and the mixed silanol solution can generate a surface protective film on a metal matrix. The surface silanization treatment agent has the advantages of no need of heating, no phosphorus and sediments and heavy metals, less energy consumption and simple management method, and the treatment agent can provide excellent adhesive force for combination between metal substrates and polyester, epoxy, acrylic and other types of coatings. The metal surface silanization treatment agent is particularly applicable to non-phosphorus environmentally-friendly conversion coating treatment on surfaces of cold rolled steel, zinc, iron, aluminum and aluminum alloys.