The invention discloses an AC-DC dual-power supply module for a data acquisition terminal. The AC-DC dual-power supply module comprises a main power supply, a standby power supply, a dual-power switching device and a switching power supply. The main power supply and the standby power supply are connected with the switching power supply through a normally open switch and a normally closed switch of the dual-power switching device respectively. The switching power supply is a switching power supply with AC-DC input and 5 V output, 12 V output and 24 V output. The main power supply is an AC 220 V power supply. The standby power supply is a DC 220V power supply or an AC 220 V power supply. An AC relay is adopted for the dual-power switching device. According to the AC-DC dual-power supply module, dual-power input is achieved through the dual-power switching device, when one power supply fails, the failed power supply is automatically switched to the other power supply, in this way, the operation reliability of the data acquisition terminal is improved, and meanwhile the AC-DC dual-power supply module has the advantages of being low in power consumption and low in cost.