The invention discloses a dyeing process of imitation leather, which belongs to the technical field of imitation leather processing, and its technical points include gray cloth unwinding, cleaning, decontamination and rinsing, dehydration and opening, drying, napping, dyeing, dehydration and opening, and shaping After drying, cooling and shaping, and rolling into the warehouse, the finished imitation leather can be obtained. By adjusting the sequence of each step, the invention can not only improve the dyeing effect and dyeing uniformity of the imitation leather, but also further optimize the process and improve the efficiency. Secondly, the pretreatment of the fluffing agent and the softening agent can make the fluffing effect of the gray cloth better in the later process of napping, and at the same time increase the softness of the gray cloth. In addition, when drying and setting the temperature in two steps, not only can the excess water in the imitation leather be removed, but also the effect of adjusting the width of the imitation leather can be achieved, so that the hair surface of the imitation leather is more uniform and smooth.