Passive flow monitoring instrument for internet of things

The invention discloses a passive flow monitoring instrument for the internet of things. The instrument comprises a sensing mechanism, a control mechanism and a power generation mechanism, wherein thesensing mechanism comprises a flow sensor arranged in a fluid pipeline; the control mechanism comprises a control unit which is fixedly arranged outside the fluid pipeline; the control unit comprisesa mainboard; the mainboard is electrically connected with a display screen, an NB-IoT module and a collecting circuit; the collecting circuit is electrically connected with the flow sensor; the powergeneration mechanism comprises a micro-generator arranged outside the fluid pipeline; a driving shaft of the micro-generator extends into the fluid pipeline; an impeller is fixedly arranged on the driving shaft in a sleeving mode; the impeller is located in front of the flow sensor in a flowing direction of a fluid; the micro-generator is electrically connected with a lithium battery through a protective circuit; and the l