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In order to meet the teaching demonstration needs of the automatic test system course experiment, a set of multi-channel automatic test system based on LAN-based extensions for Instrumentation(LXI) bus was designed and developed with a signal conditioning module as the object under test. The automatic test system is mainly composed of excitation signal source, signal conditioning module, data collector and designed channel selection module. The designed adapter board is based on the ATmega328-PU single-chip microcomputer, adopts the level conversion chip CH340T to implement the communication with the upper computer, and uses the ULN2803 driver chip to implement the drive control of the relay switch; In the software design, the "producer-consumer" architecture is used to design the control software, the object-oriented programming idea is adopted to encapsulate the operation function of the equipment, and the human-computer interface is developed based on LabVIEW according to the technical requirements. Through the experimental test, the automatic test system can be controlled by a computer to generate the excitation signal of the signal conditioning module, and has the functions of collecting, analyzing, processing and displaying the output signal of the signal conditioning module, which meets the teaching demonstration needs of the automatic test system course experiment through practical application.