ABSTRACT:Casuarina cunninghamiana is a fast growing, evergreen pine tree. It is a well-known xerophytic plant of the tropics and subtropics region. It is endemic to coastal area and its origin from Australia. The current study has been done to examine the Pharmacognocstical, Phytochemical analysis and In vivo antidiabetic activity of successive solvent seed extract of Casuarina cunninghamiana. The plant materials are collected from Rangareddy district and are authenticated.The pharmacognostical parameters such as Macroscopy, microscopy, powdermicroscopy, physiocemical constants and to determine the inorganic elements present in the seed. The seeds can be well dried and make into a coarse powder. Then it is subjected to continuous hot percolation method by using sox let apparatus. In successive solvent seed extraction, the extracts can be obtained from different types of polarity solvents namely non polar (hexane), mid polar (ethyl acetate) and polar solvent (ethanol). Its secondary metabolites are evaluated by preliminary phytochemical analysis. The quantification of phyto constituents such as quercetin, Kaempferol, stigma sterol, Rutin, Ellagic acid are carried out by HPTLC, LC-MS. The antidiabetic activity of seed extract is confirmed by alpha amylase inhibitor assay and glucose uptake assay by using 3T3 L1 cell line.