The preliminary screening of phytochemical constituents of artificial mangroves in vellar estuary has been studied. Different plant parts such as leaves, flowers and bark were extracted and the maximum extract was found in the leaf extracts of R. mucronata (35.86 %). All phytochemicals tested found to be present in all the species except phlobatannins and anthroquinones. However, anthroquinones found to be present in the leaf of A. officinalis and A. marina. The leaf part showed maximum proximate composition in all mangrove species followed by the flower and bark. It was also found that, the gross energy and caloric values was found to be higher in the leaves of all mangrove species and the bark exhibited lower energy content