Due to the large size and complicated structure of the slewing bearing of space launching tower, it is difficult to directly disassemble and maintain. Tradition bearing cleaning fluids, such as aviation kerosene, have some disadvantages, such as incomplete cleaning, flammability and explosiveness, and harmful to human health. Therefore, a new cleaning fluid for the spacecraft slewing bearing has been composited by analyzing the chemical composition of bearing grease. The experimental results show that the proposed cleaning fluid is easy-compositing and convenient for storage with a high oil removal rate.