The invention relates to a construction method for excavating a coral shallow area with cutter suction dredgers and belongs to the technical field of coral shallow area construction. The construction method for excavating the coral shallow area with the cutter suction dredgers is characterized in that two dredgers enter the coral shallow area and excavate an upper layer and a middle layer, three dredgers are retreated, a mass layer is excavated, the manner that string anchors are put down in the coral shallow area, and the anchor claw angle is adjusted or anchor chains are additionally arranged between transverse movement cables and the anchors is adopted, and the coral shallow area is excavated with the cutter suction dredgers. By the adoption of the construction method, the influence caused by the fact that collapses are generated when the coral shallow area is excavated can be effectively relieved, besides the generation of a bridge carrying phenomenon is reduced, the problems that in the coral shallow area, the anchoring is difficult, opening blocking is frequent, and a pump is blocked are solved, and the yield is increased greatly; and the construction method has the beneficial effects of being simple, effective, convenient to operate, high in construction efficiency, high in construction process, high in construction efficiency and the like.