Modularized NB-IoT water meter structure with extended functions

The invention discloses a function-extended modular NB-IoT water meter structure which comprises a water meter body, a rotating mechanism is installed at the bottom of the water meter body and comprises a sensor and a rotating disc driving the sensor to rotate, a fixing shaft coaxially and fixedly penetrates through the rotating disc, and a fixing ring is fixedly installed at the bottom of the water meter body; the turntable is rotatably mounted in the fixing ring, two limiting frames which are symmetrically distributed are arranged on the surface of the turntable, a positioning block is slidably clamped in each limiting frame, two gear rings with opposite tooth directions are mounted on the inner side surface of the fixing ring in parallel, and the positioning blocks are meshed with the gear rings in a one-to-one correspondence manner. The direction of the sensor can be adjusted according to actual needs, the rotating ring in direct transmission is arranged outside the water meter body, the rotating ring con