It is the high displacement characteristic - superior to the single-cylinder rotary compressor (SRC) - that has enabled the twin-cylinder rotary compressor (TRC) to dominate the room air conditioners market as one of the most prevalent compressor types. However, wear-related failures remain prevalent in critical friction pairs. Therefore, it is necessary to conduct tribological design based on tribo-dynamic analysis of TRCs, which has not been studied in detail before. In this study, a tribo-dynamic model considering the multi-body coupling of the crankshaft and pistons, as well as the elastic deformation of the bearings, is established for TRCs. The numerical results indicate that the crankshaft of the TRC exhibits more stable periodic motion, and superior tribological performance compared to the SRC. Additionally, the multi-body coupling model more accurately reflects the force transmission characteristics between the piston and crankshaft, while bearing elastic deformation significantly influences oil film pressure distribution and crankshaft dynamics. Considering deformation, the calculation results for the radial sliding bearing show contact occurrence, with a minimum oil film thickness of 0.48 μm matching actual failure modes. The model established in this study can accurately capture the tribo-dynamic performance of TRCs and provide a theoretical foundation for their tribological design.