The eccentric cylinder sleeve is an exclusive precision wear-resistant component for single-cylinder hydraulic cone crushers, and a core matching part of the eccentric mechanism of hydraulic cone crushers. Mounted between the eccentric sleeve assembly and the hydraulic cylinder block of the main machine’s lower frame, it serves as a key component connecting mechanical transmission and hydraulic adjustment, and integrates three core functions: wear protection, hydraulic chamber sealing and eccentric motion guiding. It directly ensures the realization of core hydraulic functions of single-cylinder hydraulic cone crushers such as hydraulic cavity clearing, overload protection and precise adjustment of crushing cavity gap, while reducing wear and deflection during the operation of the eccentric sleeve.