Positive-displacement type NB-IOT Internet-of-Things water meter

The invention belongs to the field of water meters and relates to a positive-displacement type NB-IOT Internet-of-Things water meter. The positive-displacement type NB-IOT Internet-of-Things water meter comprises a base meter and a communication circuit box; the base meter comprises an upper shell and a lower shell; the upper shell and the lower shell enclose a closed cavity; a water inlet is formed in the lower end of the lower shell; a water outlet is formed in the upper end of the upper shell; the base meter further comprises a piston type metering core arranged in the closed cavity and a counter assembly connected with the piston type metering core; the communication circuit box comprises a circuit box body and a circuit board assembly; and the circuit board assembly comprises an MCU module, a sampling circuit module, an NB-IOT wireless transmission module, an antenna module and a power source module. The water meter comprises the base meter and the communication circuit box; the circuit board assembly in