To fit a hoisting rope independent of diving work.

A hoisting rope fitting system for a sunken body is composed of a workboat 1 elevating a coiled tubing 4 having a digger 5 at the tip; a guide stack 13 having a guide shooter and a sending machine; a locking part 10 installed in the digger; a locking receiving part installed in the guide stack, locked in the locking part, and preventing the coming off of the guide stack in the state that the coiled tubing is hung; a wing bent substitute 11 for giving lift to the digger when the guide stack reaches the sea bottom, digs the sea bottom comprising sand, rock, and mud in the lower part of a sunken ship with the digger.