The invention discloses a six-axis attitude adjusting platform for installation for a complete set of engines for aircraft engines. The six-axis attitude adjusting platform comprises an operation table, a Y-axis translation mechanism, a C-axis slewing mechanism, four sets of herringbone hinge mechanisms, a cradle type platform frame and an X-axis propelling mechanism. According to the six-axis attitude adjusting platform disclosed by the invention, improvement is performed based on a conventional multi-axis attitude adjusting platform, so that the adjustable freedom degree is increased, and adjusting of the position attitude in six space freedom degree directions of the engines (namely X-axis horizontal propelling, Y-axis horizontal moving, Z-axis vertical lifting, A-axis left-to-right pitching, B-axis front-to-rear pitching, and C-axle horizontal rotating) is realized. Through the adoption of the six-axis attitude adjusting platform disclosed by the invention, in the mounting process of the aircraft engines, the adjusting of the position attitude in six space freedom degree directions is realized; the adjustable freedom degree is high, so that the mounting attitude of each engine is accurate; and the adjusting of the position attitude in the six free degrees of each engine adopts a servo motor to perform digital controlled attitude adjusting, so that the attitude adjusting accuracy and the attitude efficiency are improved; and the mounting efficiency and the mounting quality of the aircraft engines are further improved.