The invention discloses a process for preparing an activated mixed material through strand sintering of coal gangue. The process comprises the following steps: (1) crushing; (2) preparing materials, and uniformly mixing, namely sufficiently and uniformly mixing crushed coal gangue, quick lime, a carbon fuel and water in a cylinder mixing machine in a set ratio; (3) pelletizing, namely pelletizingthe uniformly mixed minerals into beads of a preset granularity; (4) sintering, namely performing allocation, ignition, air sucking sintering and cooling on the pelletized beads in a strand air sucking sintering machine; (5) crushing and finely grinding, namely crushing the sintered material, and finely grinding till a set specific surface area, thereby obtaining the activated mixed material. Theinvention provides the process for preparing an activated mixed material through strand sintering of coal gangue, by virtue of the properties that a combustion zone is high in temperature and short intime in the sintering process, a vitric phase can be formed, meanwhile, the sintered material mainly contains an oxidation atmosphere, harmful components such as organic matters, residual carbon andsulfur in the coal gangue can be removed at a high temperature, and the cementing property, the freezing resistance and the durability of cement are protected from adverse influence of the harmful components.