Aluminum alloy low chromium passivation solution and preparation method of passivation solution

The invention relates to an aluminum alloy low chromium passivation solution. The aluminum alloy low chromium passivation solution is prepared by, by weight, the following components of 12-18 parts of vanadate, 12-20 parts of tetrabutyl titanate, 12-20 parts of titanium sulfate, 1-5 parts of aluminum oxide, 2-6 parts of aluminum sulfate, 3-10 parts of sodium sulfate, 5-8 parts of waterborne macromolecule emulsion, 0.1-0.5 part of phospating accelerator and 35-40 parts of deionized water. A passive film formed by the aluminum alloy low chromium passivation solution has the high stability and corrosion resisting property and the certain antioxygenic property, and can effectively prevent aluminum alloy materials from being corroded by the outside and effectively prolong the service life of the aluminum alloy materials; the aluminum alloy low chromium passivation solution is a good passivation solution which can replace a chromate passivation solution.