The utility model discloses a steel cable test detection tool for an aero-engine. The device comprises a chest expander and a rope head fixer fixed on the chest expander, a connecting hole is formed in one end of the chest expander; a clamping groove is formed in the other end; the rope head fixer comprises a roller and a screw; 1/3-1/2 part of the idler wheel is embedded into the clamping grooveand fixedly welded with the clamping groove, a containing hole is formed in the center of the idler wheel, a threaded counter bore is formed in the side, close to the containing hole, of the idler wheel, the screw is in threaded connection with the threaded counter bore, and a through groove penetrating through the outer diameter of the idler wheel is formed between the containing hole and the threaded counter bore. The rope head fixing device can quickly fix the rope head of the steel rope, can detect and test the steel rope through connection of the chest expander detection device, and has the advantages of being simple in structure, easy and convenient to operate, capable of improving the accuracy of detection data and the like.