The invention relates to a water intake structure of coastal thermal power plants. The water intake structure comprises a water intake open channel, a pump house fore bay and transition sections; thewater intake open channel comprises two slopes oppositely arranged, and the two slopes are defined to form a water intake channel; the pump house fore bay comprises two side walls oppositely arranged,and the two side walls are defined to form a water inlet of the pump house fore bay; the two transition sections are connected between the two slopes and the two side walls respectively, and the twotransition sections are defined to form a transition channel communicated between the water intake channel and the water inlet; each transition section comprises a first connecting end connected withthe corresponding side wall, a second connecting end connected with the corresponding slope and a transition surface, and the transition surface is connected between the first connecting and the second connecting end, and is a hook face facing the transition channel. The water intake structure is low in cost, and can be applied to construction plants with a small space.