The utility model discloses a low-power-consumption data acquisition system, which comprises a data acquisition unit and a monitoring center data receiving system, a central processing unit in the data collector is connected with a multi-channel analog quantity input and output interface, a multi-channel switching value input and output interface, an RS485 communication interface, a LoRa communication unit, a 4G communication unit and a data storage unit at the same time. The multi-channel analog quantity input/output interface is in wired connection with the field sensor; wherein the multi-channel digital quantity input and output interface is in wired connection with a field valve, the RS485 communication interface is in wired connection with a field meter, the LoRa communication unit isin wireless connection with the LoRa communication to 4G communication gateway module, and the 4G communication unit is in wireless connection with a 4G operator network. The system is suitable for monitoring production operation data of energy pipe networks such as fuel gas, heating power, electric power, water affairs and the like, and the low-power-consumption performance of the system is suitable for working conditions without mains supply on an industrial site.