The invention discloses a 
mangrove forest and submerged 
breakwater coupled ecological 
breakwater, and belongs to the field of 
coastal engineering. The 
mangrove forest and submerged 
breakwater coupledecological breakwater is characterized in that a traditional breakwater structure is innovatively coupled with a 
mangrove forest, a plurality of submerged breakwaters are periodically arranged at intervals, breakwater core stones, dimension stones, backfill soil and protective surfaces are sequentially laid in the breakwaters, and due to the existence of the submerged breakwaters, the vertical elevations of plants are changed in a staggered mode. The mangrove forest is composed of a tree crown, a tree stem and a 
tree root, the 
canopy with the most remarkable wave absorbing capacity is lifted,and therefore the effective wave absorbing 
water level is increased. Under the action of 
waves and tide, through the mode, the mangrove forest can generate more shearing 
layers, and the wave-absorbingand flow-resisting effects are enhanced; and the wave absorbing capacity of the submerged breakwater to surface 
waves can be enhanced through the mangrove forest, and the damage effect of extreme seaconditions such as 
storm surge on the submerged breakwater is weakened. The mangrove forest and the submerged breakwater are coupled, the occupied area is reduced, a win-win situation is achieved bycombining the wave absorbing characteristics of the mangrove forest and the submerged breakwater, meanwhile, 
environmental protection is achieved, and economic value and 
ecological significance are achieved at the same time.