The invention provides a phosphating treatment method for a titanium alloy fastener before painting and a phosphating treatment solution thereof, which comprises phosphating the titanium alloy fastener in a proper phosphating treatment solution, wherein the phosphating treatment solution is a solution consisting of a proper amount of phosphate containing phosphate ion (PO43-), fluoride containing fluoride ion (F-) and glacial acetic acid. By adopt that method, the production process is simple, the production efficiency is high, and the cost is low; And the phosphating solution thereof, including the adhesion to titanium alloy in a suitable phosphating solution, can meet the requirements of relevant standards.
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