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In view of the large computational complexity and high real-time requirement of the satellite signal split system, a baseband signal processing platform was designed based on FPGA+COM Express architecture. Through the analysis of system requirements, build the hardware architecture of the system, divides the system into operation module, network interface module, A/D circuit, D/A circuit, power conversion circuit and clock management circuit part, and then determine the main chip according to the specific needs of each part of the circuit selection and specific design. According to the characteristics of the system, the system operation will be divided into two categories, the data of computation and high real-time requirements but simple structure parts using FPGA, the amount of data but less control of complex structure, low real-time requirements by COM Express. Tests were performed on the platform, and results showed that, the platform met operation and real-time requirements for the satellite signal split system. This design scheme can realize all of the signal process flexibility such as signal quantization and operation and control and output for the baseband signal processing platform. This design scheme can be used as a general baseband signal processing platform, which has a short period to design and has advantages on flexibility and easy to design.