A method for preparing high maltose syrup from cadmium rice, comprising the following steps: (1) soaking and refining: adding citric acid-sodium citrate buffer solution to cadmium rice, soaking, refining, filtering, and continuing to stir the filtrate to obtain rice Slurry; (2) Liquefaction: Add citric acid-sodium citrate buffer solution to the rice slurry, and add high-temperature-resistant α-amylase preparation, stir evenly, heat to react, filter, and obtain rice dregs protein and liquefaction liquid; (3) Saccharification: cool down the liquefied liquid, add glucoamylase preparation, stir evenly, keep warm and react to obtain the saccharified liquid; (4) Ion exchange: pass the saccharified liquid through secondary ion exchange to obtain a clear and transparent liquid; (5) Concentrate and dry: The clear and transparent liquid is evaporated and concentrated to obtain high maltose syrup. The method of the invention does not need to add a cadmium removal step, and the cadmium content of the obtained product is less than 0.03 mg / kg, and the maltose content is more than 75%. The method of the invention is simple, practical, safe and reliable.