The invention relates to a loading device capable of simulating stress of helicopter blades. The loading device comprises a support (1) for fixing one end of a process beam (2). The other end of the process beam (2) is connected in series with a test piece (3). The test piece (3) is connected in series with a connector (4). The connector (4) is connected through a steel wire rope (5). A buffer (6)is arranged in the middle of the steel wire rope (5). The steel wire rope (5) is connected with a tension device (7). The steel wire rope (5) and the tension device (7) are hinged on a support rod (10). Through ingenious design of an excitation device, simulation of air and test piece force is realized; and through ingenious design of the tension device (7), simulation of centrifugal force of thetest piece is realized. The loading device can realize simultaneous loading of the centrifugal force, swing and vibration force under the test condition, and the loading process is stable and reliable, thereby preventing loading process distortion of pieces having service life in the test process.