The method for synthesizing phosphonomycin by using cis-propene phosphonic acid as raw material relates to an epoxidation eraction of cis-propene phosphonic acid by using molybdate which is sodium salt or ammonium salt generally as catalyst in the course of synthesizing phosphonomycin. According to identical process sand invention can prepare phosphonomycin disodium salt, in terminal phosphonomycin product the molbdenum content only is 1/10 (10-15 ppm) of tungsteon content, so that the use of molbdate as catalyst can reduce residual of heavy metal and can reduce toxic side effect of medicine.

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