This ?6m×90m rotary kiln equipment was imported from abroad for the 10 000t/d cement clinker production line. There were problems such as vibration at the middle foundation, wave veins on the surface of the supporting roller and tyre, easy falling of refractory bricks near the middle support, and limited kiln speed. The above problems were solved by returning the tyre and thrust roller to the factory for processing, replacing the kiln shell sections of serious thinning and deformation, and realigning the center line of the kiln shell. The driving device of the rotary kiln was replaced, which improved the power of the main motor and the running speed of the kiln. The cross section of kiln hood is increased. The kiln was equipped with the optimized inlet sealing device, hinged kiln hood door, forced circulating lubrication and cooling device for supporting roller bearing, and automatic spray lubrication system for the pads under the tyre. The sealing and lubrication effect have been improved, and the long-term stable operation have been better guaranteed. After upgrade, the rotary kiln equipment runs stably and the transformation goal is achieved.