In view of the need to simulate multiple signals in communication testing, a large-bandwidth, multi-channel signal source hardware architecture is proposed. FPGA is used as the hardware control core and baseband signal generator. The high-speed serial transceiver GTY in FPGA is used to implement the JESD204C interface protocol and complete the single-lane 16.5 Gbps data rate transmission. The CX8242K RF transceiver is used as the RF transmitter and configured through Microblaze to achieve high-quality generation of modulated signals from baseband to high-IF. Frequency planning is carried out for the target frequency band, and clock schemes and multi-channel synchronization schemes are designed. Finally, a domestically produced multi-channel vector signal source with wide bandwidth, high precision and low spurious is realized. Tests have proved that the vector signal source can normally generate various vector modulation signals, and realize carrier frequency adjustment in the range of 10 M~6 GHz, supporting a single-channel transmission signal with a maximum bandwidth of up to 800 MHz, which has high application value in actual engineering tests.