The radio-frequency (RF) system is one of the fundamental components of the storage ring. Its functions include replenishing the energy lost by the beam circulating in the ring and providing longitudinal bunching voltage to prevent longitudinal escape and loss of electrons within the bunches, ensuring a sufficiently long beam lifetime. The BEPCII RF system employs state-of-the-art superconducting radio-frequency (SRF) technology and originally consisted of two subsystems, each comprising a 500 MHz SRF cavity, a 250 kW klystron power source, and an analog low-level RF control loop. After the completion of the BEPCII upgrade in 2024, the RF system now includes four subsystems, featuring a total of four SRF cavities, one 250 kW klystron power source, three 200 kW all-solid-state power sources, and four digital low-level RF control systems.