Method for detecting beryllium content in water

The invention discloses a method for detecting beryllium content in water. The method comprises the following steps of: adding a water sample to be detected and more than 30 parts of beryllium ion standard using solutions with different beryllium ion concentrations and the same volume into a colorimetric tube respectively, adding 2.0mL of pH regulating agent, 0.10g of sensitizer and 0.050g of color-developing agent respectively in turn, and diluting to reach a scale of 10mL through distilled water; and observing color change conditions of liquid in the colorimetric tube after colors change, wherein the beryllium ion concentration in the water sample is between the products of the beryllium ion concentrations in the two beryllium ion standard using solutions and a dilution factor if the color of the water sample to be detected is between colors of the beryllium ion standard using solutions with two certain adjacent concentrations, and the beryllium ion concentrations in the beryllium ion standard using solutio