The invention discloses a non-chromium passivation solution for hot-dip galvanizing and a preparation method thereof and belongs to the technical field of post-treatment of hot-dip galvanizing and zinc coatings. The non-chromium passivation solution is prepared from 5-10 ml/l of HNO3, 1.5-3 g/l of NaF, 5-8 ml/l of H3PO4, 2-3 g/l of BaCO3, 2-4 ml/l of phytic acid, 1-3 ml/l of shellac solution and distilled water. The non-chromium passivation solution for hot-dip galvanizing does not contain Cr6+ and Cr3+, and existence and harm of chromium are thoroughly eliminated from the source of the process. When the non-chromium passivation solution is used for a hot-dip galvanizing layer, a uniform passivation film can be formed on the surface of the galvanizing layer, and the passivation film is in a closed state. The passivation and closing double effects on the surface of the hot-dip galvanizing layer are achieved.