Proposed is a detachable mooring system for an offshore structure, including a first tension adjuster connected to an offshore structure, and blocking a pulling chain from proceeding from an outlet of a body toward an inlet, a second tension adjuster connected to one end of the pulling chain and blocking the pulling chain from proceeding from an outlet of a body toward an inlet, a mooring chain having a first longitudinal end connected to one surface of the second tension adjuster body and having a second longitudinal end connected to an anchor on the seabed, a first lead rope having one longitudinal end connected to one end of the pulling chain discharged out through the first tension adjuster outlet, and a second lead rope having one longitudinal end connected to the second tension adjuster body.