The electromagnetic converter core of an intelligent electromagnetic flowmeter uses a high-speed central processing unit. The calculation speed is fast, the precision is high, and the measurement performance is reliable. The input impedance of the converter circuit is up to 1015 ohms, the common mode rejection ratio is better than 100db, the rejection ability of external interference and 60Hz/50Hz interference is better than 90db, and the flow rate of the fluid medium with low conductivity can be measured. The sensor adopts non-uniform magnetic field technology and a special magnetic circuit structure. Stable and reliable magnetic field, reduced repetition, reduced flowmeter volume, flow friendly.