The invention provides a method for determining tungsten content in a tungsten-containing polyethylene composite shielding material. The method comprises the steps of: 1, weighing a certain amount ofsample, putting the sample into a quartz crucible, slowly heating and firing the sample in a muffle furnace, and taking the sample out after cooling; 2, transferring the sample into a beaker, adding asodium hydroxide solution into the beaker, heating the beaker until the sample is dissolved, cooling the heated sample, and filtering the sample with medium-speed quantitative filter paper; 3, addinga hydrochloric acid into the filtrate, carrying out water-bath heating and concentration, adding deionized water into the product, adding a cinchonine solution into the mixture after slightly boiling, fully stirring the mixture, and carrying out heat preservation on the mixture; 4, filtering the mixture with dense quantitative filter paper, washing precipitate with cinchonine lotion for multipletimes, transferring the precipitate and the filter paper into a fired platinum crucible, and placing the precipitate and the filter paper in a muffle furnace and firing the same; step 5, taking out the fired precipitate, the filter paper and the platinum crucible together, cooling them to room temperature, adding an hydrofluoric acid and a plurality of drops of concentrated sulfuric acid into theplatinum crucible, carefully heating and evaporating the liquid, firing the platinum crucible, firing the platinum crucible again and then cooling the product to room temperature, and weighing the product until the weight is constant; and step 6, calculating to obtain the tungsten content in tungsten-boron polyethylene according to a predetermined formula. The implemented method is high in detection precision and high in repeatability.