The invention discloses a method for removing tellurium from crude selenium slag. The method comprises the following steps: an oxidizing agent is added to the crude selenium slag and stirred, a primary product is obtained after tellurium in the crude selenium slag is subjected to a reaction with the oxidizing agent, vacuum distillation is performed on the primary product to enable selenium in theselenium slag to be volatilized while tellurium is not volatilized, and a selenium product with low tellurium content is obtained by recovery. The oxidizing agent is added to the crude selenium slag and subjected to an oxidation reaction with tellurium in the crude selenium slag, and accordingly, form of tellurium is changed; based on the property difference between tellurium oxide in the changedform and selenium in a vacuum state, tellurium is removed from selenium by vacuum distillation, content of tellurium in selenium is reduced, and the selenium product with purity higher than 99.9% is obtained.