The invention discloses a method used for goethite process iron removal with manganese-contained smoke dust as a catalyst. In the zinc leaching agent goethite process iron removal (sulphuric acid medium) system, the manganese-contained smoke dust is used as the catalyst, air serves as an oxidizing agent, a 10% sodium carbonate solution serves as a neutralizing agent, and under the certain temperature and stirring condition, the use amount of the manganese-contained smoke dust and the oxidation rate of Fe2+ are subjected to expedition. Through the result, it finds that the industrial solid waste manganese-contained smoke dust serves as the catalyst, and the oxidation rate of Fe2+ in the goethite process iron removal system can be increased, within a certain manganese-contained smoke dust use amount range, the oxidation rate of Fe2+ is increased along with increasing of the manganese-contained smoke dust adding amount, when the use amount of added manganese-contained smoke dust exceeds about 4.0g/L, the influence of increasing of the manganese-contained smoke dust amount on the Fe2+ catalytic oxidation rate tends to be gentle, and it is considered that when the adding amount of the manganese-contained smoke dust is about 4.0 g/L, oxidation of Fe2+ in the system is in the ideal degree.