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According to the characteristics of QPSK modulation method, a signal Interference source based on FPGA is designed. The principle of jamming is analyzed; the m sequency is used to generate homogeneous distribution, it is translated to Gaussian noise by address method; Logistic chaotic circuit is used as signal source; direct digital frequency synthesize is used to generate sine wave as carrier; VHDL is used to design FPGA and MCU interface circuit; under control of MCU, the interference signals in FPGA is produced by AD9760 analog-to-digital conversion. The simulation and experiment show that the system has high accuracy and its interference parameters are easy adjusted. The system meets the actual demand and can generate multi-channel synchronous jamming signal.