The invention discloses a method and device for measuring the shape of a mooring foundation installation mooring rope in seabed soil, and belongs to the technical field of oceanographic engineering monitoring. According to the method, multiple inclination angle sensors are arranged on the mooring foundation installation mooring rope, the distance between every two adjacent inclination angle sensors can be directly obtained through measurement after installation is well achieved, and due to the fact that the inclination angle data of the inclination angle sensors can be transmitted to working staff in real time even when the inclination angle sensors are in the seabed soil, the shape of the mooring foundation installation mooring rope in the seabed soil can be dynamically measured in real time; meanwhile, the inclination angle sensors are precise measurement instruments, the accuracy of the real-time azimuth angles, measured through the inclination angle sensors, between the inclination angle sensors and the horizontal direction is high, and therefore the accuracy of the method for measuring the shape of the mooring foundation installation mooring rope in the seabed soil is high. By means of the device, fitting of the shape of the mooring foundation installation mooring rope in the seabed soil can be automatically completed without artificial calculation, and the device is more suitable for production practice.