Aim: Standardization of a Siddha Poly herbal compound formulation is essential for establishing its authentication quantity and efficacy. In this present study, an attempt has been made to standardize the KaranthaiChooranam (a polyherbal formulation that contains 14 plant materials). Hence standardization of traditional drugs becomes highly essential to explore their potency and efficacy in the global market. It has been increasing public interest and acceptance of traditional medicine. Methods: Physico-Chemical analysis, Phyto-Chemical Screening, Particle Size, Pesticide Residue, and Sterility test were performed as per PLIM (Pharmacopeia Laboratory of Indian Medicine) guidelines. Results: The loss of drying of the tested drug was 105°c .KC contains 0.59% acid-insoluble ash and solubility in the water was 9.63 %. Phytochemical screening KC has shown the presence of Alkaloids, Glycosides, Saponins, Phytosterols, Fixed Oil, Resins, Phenols, Flavonoids and Tannins. Microscopic observation of the particle size analysis reveals that the average particle size of the sample was found to be 115.5 ± 42.83 μm. Conculsion: From this set of parameters, it can be concluded that it is sufficient to evaluate the authenticity of KaranthaiChooranam can be used as a reference standard for the preparation of the standardized pharmaceutical product and further quality content research. This study suggests that quality specifications of KC can be developed using parameters described in Siddha along with analytical tools available today.