The invention relates to a plug-and-play terminal device in a test data acquisition system; the plug-and-play terminal device comprises an aviation plug, a resistor and a capacitor; the aviation plug comprises an aviation plug male joint and an aviation plug female joint; the resistor and the capacitor are connected in series between the anode and cathode of the aviation plug female joint; epoxy resin is poured into the aviation plug female joint; a terminal circuit is welded into the pluggable aviation plug female joint; a COMMS OUT end of an acquisition board is led by the aviation plug male joint to be outside an acquisition board shell; the aviation plug female joint with the terminal circuit is connected with the aviation plug male joint, and the acquisition board to which the aviation plug male joint is located can serve as the last acquisition board; the plug-and-play terminal device is flexible and convenient in usage, can be repeatedly used, thus saving acquisition board numbers prepared in the construction field each time; the installation can be finished without opening the acquisition board shell in each time plugging/unplugging, so operation is simple.