The invention discloses an AC-DC voltage acquisition circuit of a data acquisition recorder, and belongs to the technical field of a circuit structure of electronic hardware equipment. The AC-DC voltage acquisition circuit of the data acquisition recorder comprises a circuit protection structure, a signal processing structure and a reference voltage structure, wherein the circuit protection structure, the signal processing structure and the reference voltage structure are connected in parallel and are connected with ground, the circuit protection structure comprises an input voltage protectionmodule, a first voltage attenuator, an overvoltage protection module and a second voltage attenuator, the signal processing structure comprises a common-mode noise suppression module, an isolation amplifier, a differential-to-single end module, a buffer amplifier and an analogue-digital converter, and the reference voltage structure is a band gap diode. Compared with an acquisition circuit of anexisting wave recorder, the AC-DC voltage acquisition circuit of the data acquisition recorder has the advantages that the circuit is relatively simple in structure and low in material cost, has multi-stage protection and isolation function and is suitable for rapid deployment of production line, and the signal data acquisition safety of the data acquisition recorder is greatly improved.