The invention discloses a beneficiation method of mixed copper ore having a low oxidation rate and a high binding rate. With the respect to sulfide-oxidized mixed copper ore having a low oxidation rate and a high binding rate, copper sulphide ore and free copper oxide ore in the sulfide-oxidized mixed copper ore are recovered through floatation, flotation concentrate is subjected to desulphurizing roasting and copper oxide concentrate is obtained, roasting flue gas is used for leaching out refractory copper oxide and binding copper in flotation tailings, then copper ions in ore pulp are leached out by sodium sulfide sediment tailings and copper sulphide sediment is obtained, xanthate is added for the floatation of the copper sulphide sediment and copper sulphide concentrate is obtained, the cupric sulfide concentrate and sulfide-oxidized mixed copper concentrate are mixed, then a mixture is subjected to the desulphurizing roasting and final copper oxide concentrate is obtained. According to the method, the low-grade tailings are leached out by sulfur dioxide generated by sulfur in the concentrate of the mixed copper ore, refractory free copper oxide and bound copper, which are difficult to recover, in the flotation tailings are recovered, the cost is low, and a comprehensive recovery rate of copper is raised significantly.