The invention relates to a detachable natural gas measuring device comprising a control mechanism, adjusting mechanisms and a detection mechanism; the adjusting mechanism comprises adjusting rods, a drive motor, a drive shaft and a mount mechanism; the mount mechanism comprises a housing; a work power supply module comprises a work power supply circuit including an integration circuit; the detachable natural gas measuring device respectively arranges the drive motor and the mount mechanism on two ends of the adjusting rod, and various adjusting mechanisms can mutually connect and match the drive motor and mount mechanism, thus flexibly dismounting the device; in addition, the drive motor can control different angles between the adjusting rods, thus detecting different area angles in the pipeline; in addition, in the work power supply circuit, the third end of the integration circuit can collect a sample voltage; a voltage stabilization triode can stabilize the output voltage; so when the load fluctuates, the sample voltage has no fluctuation, thus improving the power supply voltage output stability.