The invention relates to a method for removing arsenic and antimony in industrial wastewater by using smelting furnace slag. The method comprises the following steps: adding acid to the industrial wastewater containing more than 10mg/L of As and more than 10mg/L of Sb so as to adjust the acidity, and controlling the pH to 0.5-4; adding the smelting furnace slag and an oxidizing agent, enabling the smelting furnace slag to chemically react with or physically adsorb As<3+> and Sb<3+> in the wastewater under acidity and oxidation atmospheres, controlling the temperature at 40-100 DEG C, and carrying out heat preservation reaction for 1-3 hours; adding a neutralizing agent for neutralization, and controlling the pH to 6-9; filtering a solution so as to obtain filtrate and filter residues, if the As contained in the filtrate is less than 0.3mg/L and Sb contained in the filtrate is less than 0.5mg/L, meeting the residue removal standards, feeding the filtrate to a wastewater treatment system for further purifying other impurities, if the As contained in the filtrate is more than 0.3mg/L and the Sb contained in the filtrate is more than 0.5mg/L, repeating the steps till meeting the residue removal standards, and sending the filtrate residues to a filter residue yard for storage. The method has the advantages that the smelting furnace slag is used for replacing a precipitant so as to remove impurities, the arsenic and the antimony in the wastewater are rapidly and efficiently removed within 1 to 3 hours, the removal rate is close to 100%, the method is high in efficiency and low in cost, and the filter residues have good crystal structures, are easy to clarify and filter and contain arsenate and antimonite formed by iron, calcium, magnesium, aluminium, pentavalent arsenic and pentavalent antimony and have stable chemical property.