The invention belongs to the technical field of titanium slag smelting, and mainly relates to an ilmenite concentrate pretreatment method. According to the technical aims, S in ilmenite concentrate is desorbed, and the ilmenite concentrate can be well used as raw materials for smelting titanium slag. According to the technical scheme, the ilmenite concentrate pretreatment method comprises the following steps that the ilmenite concentrate is graded after oxidizing roasting, and materials with the granularity being +200 meshes are directly collected to be used as the raw materials for smelting the titanium slag; and the materials with the granularity being +200 meshes are subject to pelletizing, and obtained green balls are dried to be used for the raw materials for smelting the titanium slag. By means of the method, the S in the ilmenite concentrate can be desorbed, and the ilmenite concentrate is used for smelting the titanium slag and has the beneficial effect of being favorable for the environment.