The present invention also provides a surface treatment solution for light metals or alloys thereof, which comprises titanium element in water-soluble form, vanadium element in water-soluble form, an organic acid and water, wherein said organic acid contains 1-100 carbon atoms, 2-50 oxygen atoms. The present invention also provides a surface treatment method for light metals or alloys thereof, which comprises pre-treating light metals or alloys thereof, then contacting with the surface treatment solution of the present invention. The surface treatment solution of the present invention is suitable for a plurality of light metals or alloys thereof to improve their corrosion resistance, coating performance and surface conductivity, is chromium-free formulation, and is easy to formulate and is stable. The surface treatment solution satisfies environment protection requirements, and is characterized by a wide operation application range, easiness in removing its residue, and good industry applicability"
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