Fecha de publicación: 15/05/2020 Fuente: Wipo "IOT" The utility model discloses an NB-IOT transmission system for a septic tank. The system comprises a data acquisition terminal, a main controller and a data receiving terminal, the data acquisition terminal is arranged in the septic tank; the device comprises an RS-485 communication circuit and an NB-IOT network access circuit, the main controller comprises an RS-485 interface corresponding to theRS-485 communication circuit; the NB-IOT module is corresponding to the NB-IOT network access circuit; wherein the data acquisition terminal is connected with the controller to store acquired data into the main controller, the main controller is further provided with a USR-NB75 module used for transmitting data to the NB-IOT base station, and the data receiving terminal is connected with the controller to receive information acquired by the data acquisition terminal. The system solves the problems of high data transmission cost and poor transmission effect of NB-IOT in the septic tank, and issuitable for popularization and application.