Aiming at such problems as high manufacturing cost and operating power consumption of the ring cooler, a lightweight study of rotary frame in the key component of ring cooler is conducted. Through the modeling software and simulation analysis software, the stress and the displacement of the rotary frame in the key parts are simulated and optimized, and the relevant process optimization measures are determined. The results show that there is a small increase in stress (0～20 MPa) after thinning the rotary frame compared to the stress before thinning, but it is well within the safe range of stress; the displacement deflection of the rotary frame is 4 mm and the relative rotation angle of its inner and outer rings is very small and also well within the safe distance. The improved rotary frame of the ring cooler can reduce the cost of raw materials for production by about 14%.