The invention relates to the technical field of wind tunnel tests, in particular to a wind tunnel test model parallel mechanism support device for aircraft formation flight. The parallel mechanism support device includes a frame, aircraft models for formation flight, a plurality of first rope traction assemblies, a plurality of second rope traction assemblies, two guide rail assemblies, and a machine vision camera. The aircraft models are all pulled by ropes and achieve six-degree-of-freedom motion through a parallel mechanism. The parallel mechanism support device not only has high rigidity,good stability, large working space, and can conveniently realize various formation flight of the aircraft models, but also can effectively avoid interference between the traction ropes, interferencebetween the traction ropes and the aircraft models, and interference between the aircraft models and surrounding obstacles. The parallel mechanism support mechanism has little interference on the flowfield around the models, is helpful to simulating the influences of the airflow between the aircraft models for formation flight, and improves the validity and credibility of the wind tunnel test results.