The invention belongs to the aircraft test flight technology, and particularly relates to a noise qualification approval equivalent test flight method of a large transport-category aircraft. The noise qualification approval equivalent test flight method of the large transport-category aircraft includes the steps of symmetrically setting three noise measurement points in the direction perpendicular to the center extension line of an airport ground track, carrying out an airworthiness noise flight test with a flight path plunge method, after the aircraft takes off, entering flight path plunge points to set the engine power, the flight height and the flight speed, carrying out the flight test according to a reference flight path, measuring noise when the aircraft reaches the preset height above the noise measurement points, going around to pull up the aircraft after noise measurement is completed, and repeatedly carrying out a next flight test, wherein in the whole test process, the aircraft keeps flying all the time. According to the noise qualification approval equivalent test flight method, the noise measurement points are greatly reduced, required noise test devices and required test persons are greatly reduced, cost is reduced, the test flight efficiency is improved, the test flight cycle is greatly shortened, the service life of an engine is prolonged, a test site is flexibly selected, and flight tasks of aircrafts in other types in the site can not be influenced.