Self-powered electromagnetic flowmeter

The self-powered electromagnetic flowmeter comprises a shell, an electromagnetic core machine and a fluid power generator assembly, a medium channel is formed in the shell, the electromagnetic core machine and the fluid power generator assembly are fixedly installed on the medium channel, and the electromagnetic core machine measures the flow of fluid in the medium channel through electromotive force induced when a magnetic field is externally applied. The fluid generator assembly generates electricity for the electromagnetic core machine through fluid flowing in the medium channel and comprises an energy storage and power supply module, a rectification and voltage stabilization module, a permanent magnet micro generator and an impeller, the energy storage and power supply module, the rectification and voltage stabilization module and the permanent magnet micro generator are arranged outside the medium channel, and the impeller is rotationally installed in the medium channel and provided with a rotating shaft