The invention discloses a detachable type single-wall steel suspension box cofferdam structure and an integral hoisting construction method. The detachable type single-wall steel suspension box cofferdam structure is of a detachable type structure comprising section steel and a steel plate. The detachable type single-wall steel suspension box cofferdam structure comprises a wall plate, enclosing purlins, an inner support and a suspension system, wherein a vertical rib and a horizontal reinforcing rib are arranged on the outer surface of the wall plate; a bottom plate is connected on the bottom of the wall plate; enclosing purlins are arranged at the inner side and the outer side of the wall plate; the inner support is supported on the enclosing purlin at the inner side; the enclosing purlin at the outer side is connected with the vertical rib through a bolt; a self-balancing opposite-pulling rod is arranged between the enclosing purlin at the inner side and the enclosing purlin at the outer side; the inner end of the self-balancing opposite-pulling rod is anchored on a flange of the inner support, and the outer end of the self-balancing opposite-pulling rod is anchored on the enclosing purlin at the outer side; the suspension system comprises cross suspension frames and a lifting lug, wherein threaded steel lifting rods are arranged on four end parts of each cross suspension frame respectively, and the lower ends of the threaded steel lifting rods are anchored on a bottom plate supporting beam. The detachable type single-wall steel suspension box cofferdam structure is simple in structure, small in steel dosage, less in field welding amount, convenient to assemble and disassemble and easy to process, and other components except from the bottom plate can be recycled.