Roots type flowmeter

The utility model relates to a Roots type flowmeter, which comprises a meter, a counter and an integrating instrument component, wherein the meter comprises a sealing meter case, a rotor component, a synchronizing gear and a measuring alnico component; the measuring alnico component comprises an alnico shaft and a driving alnico; the counter comprises a counter cover, a counter component and a counting alnico component; the counting alnico component comprises a connecting shaft, a driven alnico and an intermediate alnico; the meter case is provided with a driven alnico hole and an inwards sunken seal cover; and the integrating instrument component comprises a flow sensor and an integrating instrument. The Roots type flowmeter solves the technical problems that the prior Roots type flowmeter causes frequent inaccurate measuring and easy leakage of gas and is easy to influence by outside environment; moreover, the Roots type flowmeter has the advantages of high precision, excellent repeatability, less starting