The invention relates to a self-controlled flow test device. The device comprises a master control computer, a filter 1, a decompressor, a pressure gage 2, a
proportioning valve, a hand valve 3, a test
liquid storage tank, a pressure gage 1, a filter 3, a
solenoid valve 3, a hand valve 1, a differential manometer, a filter 2, a
solenoid valve 1, a standard flow meter, a flow meter to be measured, a
solenoid valve 2, a
branch selector, a recycling tank, a recycling pump, a hand valve 2, a weighing module and a test weighing tank; The
gas pressure inside the test
liquid storage tank is stabilized within a specific range through large-scale coarse regulating by the decompressor and small-scale fine regulating by the
proportioning valve, which satisfies the stable requirement of constant flow test. Through acquiring data of the pressure gage and the differential manometer of the test
liquid storage tank and the flow data of the standard flow meter in real time, and through adjusting the
cushion pressure of the test
liquid storage tank, stable adjustment of
system output flow is achieved and large scale target flow changes can be adapted to. The device realizes
automation of test calibration and increases test precision and efficiency.