The invention provides a gas turbine flowmeter.A volume correction instrument is arranged on a shell, a high-pressure oil supply system is arranged in the shell, an electronic switch for recording the number of oiling times and oiling time is arranged at the high-pressure oil supply system, and is electrically connected with the volume correction instrument, and a comparing module and a reminding module are arranged in the volume correction instrument.The electronic switch provided at the high-pressure oil supply system is connected with the volume correction instrument, the volume correction instrument detects the electrical level state of the electronic switch to judge whether the flowmeter is oiled or not, and if no oiling action exists in preset time, outputting is carried out through a corresponding output interface to remind a user of maintaining and oiling.