The invention discloses a Baudrate evaluation IP core system applied to a serial bus analyzer, and relates to the field of serial bus Baudrate evaluation of a tester system. The system aims at solving the problems that the existing Baudrate evaluation method is low in accuracy, reliability and precision when obtaining the Baudrate. According to the system, the serial bus data signal output end of an AX18-bit memory mapping slave port S8 is connected with the serial bus data signal input end of a data input cache FIFO module; the serial bus data signal output end of the data input cache FIFO module is connected with the serial bus data signal input end of a Baudrate evaluation algorithm core control module; the serial bus data signal output end of the Baudrate evaluation algorithm core control module is connected with the serial bus data signal input end of a data output cache FIFO module; and the data signal output end of the data output cache FIFO module is connected with the data signal input end of the AX18-bit memory mapping slave port S8. The system is used for obtaining the Baudrate.