High-precision frequency signal source

The invention discloses a high-precision frequency signal source which comprises an STM32 control module, an RS232 serial port, a touch display, a DDS module, an FPGA module and a power supply module. The FPGA module, the touch display and the DDS module are respectively connected with the STM32 control module; the power supply module is connected with the STM32 control module, the RS232 serial port, the touch display, the DDS module and the FPGA module; the touch display is used for performing frequency parameter setting on the STM32 control module, the STM32 control module starts a communication function with the DDS module after receiving a frequency setting command, and setting of the output frequency of the DDS module is realized; when the FPGA module receives a frequency signal output by the DDS module, the frequency division function of the output frequency of the DDS module is achieved according to a control instruction of the STM32 module, and a square wave frequency signal is output by the FPGA modu