The invention relates to a combined treatment method for goethite slag and lead reducing slag. The combined treatment method comprises the steps of material proportioning; reduction smelting; blowing; water quenching. After reaction is completed, obtained slag is water-quenched so as to obtain vitreous bodies stable in property, wherein lead contained in the vitreous bodies is smaller than 0.1%, and zinc contained in the vitreous bodies is smaller than 0.2%. According to the combined treatment method, innocent treatment of the lead reducing slag and the goethite slag is realized, there is no need to add chalybeate for slag formation in the material proportioning process because the iron content is high, the usage amount of flux can be adjusted and reduced according to the content of calcium and silicon in the slag, and the cost is saved; recovery of valuable metal such as the lead and the zinc is realized, and a certain added value is generated; by adopting reduction smelting, volatile metal such as the lead and the zinc or metal alloy originally covered in smelting slag can be molten, because the vapor pressure of oxides of the metal or the metal alloy is low, volatile oxide matter is formed in the subsequent oxidation blowing process and enters smoke so as to be recovered, meanwhile, stable vitreous body slag is formed, and therefore innocent treatment is realized.