The invention provides an RS485 hub unit supporting multiple protocols. The hub unit comprises a processor; the processor is connected with a master RS485 interface and at least two slave RS485 interfaces; the processor is provided with an address mapping module, a protocol library module and a data storage module; feature parameters are set in the protocol library module; virtual addresses corresponding to slave devices are set in the address mapping module; after receiving data of the slave RS485 interfaces, the processor obtains information parameters in the data according to the protocol library module, and stores the information parameters and the corresponding virtual addresses in the data storage module; and when receiving a data reading instruction of the master RS485 interface, the processor determines the virtual address corresponding to the instruction and reads corresponding data information according to the virtual address. According to the technical scheme provided by thehub unit, the transmitted data is read and analyzed in a data forwarding process; and the problem of on-site analysis incapability in an RS485 bus transmission process can be solved.