The invention relates to a processing method and a processing device capable of mixing two fibers in a spinning process. The processing device comprises a front roller, a middle roller, a back roller, output rollers, five-mouth parallel horn mouths, a five-mouth annular horn mouth and a nozzle, wherein a pair of output rollers is arranged at the front of the front roller, a space capable of independently twisting through two yarns is formed; two five-mouth parallel horn mouths are arranged at the back of the front roller and are used for uniformly separating a fiber bundle; one five-mouth annular horn mouth is arranged at the backs of two five-mouth parallel horn mouths, and is divided into a small bundle of different fiber combinations; one nozzle is arranged between the output rollers and the five-mouth annular horn mouth, so that the yarns are twisted. According to the invention, the yarns made of two raw materials are uniformly mixed in the spinning process, and are twisted to form yarns, so that a process of drawing is shortened, the cost is saved, and the efficiency is improved.