The utility model provides a mounting device for the radome cabin of an aircraft. The mounting device comprises an operation handle, a pressure head, a fastening belt, a fixed rod, a locking rod and fixing screws, wherein the sewn end of the fastening belt penetrates into the fixed rod; the fixed rod and the locking rod are fixed in the square through hole of the pressure head through the fixing screws; the locking rod is positioned above the fixed rod and is far away from one end of the operation handle; the operation handle is in threaded connection with the pressure head. Through the adoption of the mounting device, while the radome cabin of the aircraft can be quickly mounted by screwing, the safe mounting of the radome cabin of the aircraft is ensured; therefore, the stability and reliability of the mounting quality of the radome cabin of the aircraft are improved, the production efficiency is increased, and the production cost is lowered.