The overall scheme and control method of baseband full digital TACAN signal simulator based on PXI bus interface are proposed. The FPGA chip is used to complete the baseband signal generation and various interface control circuits by digital method. The PCI9054 interface chip is used to realize the protocol conversion between the PXI bus and the local bus. The system software is developed in the Quartus II integrated development environment using the Verilog language, which is then downloaded to the FPGA chip. The results show that the simulator can meet the requirements of the automatic test of the orientation, distance and sensitivity of the TACAN airborne equipment, and improve the test efficiency. The simulator solves the problems that the traditional simulator is large in volume, low in precision, difficult to integrate and low in automatic test efficiency.