The invention belongs to the technical field of nylon production, and particularly relates to a polyamide fiber production process. A drying device in the process comprises a tower body, a tower cover, a fixing seat, a feeding hopper, a filter net, swing modules, a spring and a shaking block, and four air intake holes are symmetrically formed in the left and right sides of the tower body; the swing modules can swing after being subjected to compressed air blown by the air intake holes; the swing modules are arranged on the positions, near the four air intake holes, of the inner walls of the left and right sides of the tower body, every two symmetrical swing modules are connected to form a shaking block through two springs, and then intermittent power-on and power-off are conducted by controlling a battery valve, so that the moving directions of the two shaking blocks are always opposite, the tension of the springs on both sides of the shaking blocks is changed, so that the shaking blocks are continuously shaken, the shaking blocks push nylon slices in the tower body to turn over, and the probability of contact between nylon and hot air is increased, thereby accelerating the dryingspeed of the nylon slices.