Highly saline and highly alkaline nature of lake water is observed at Lonar Crater from ancient time till today. The formation of this lake is related to the formation of the crater by the impact of a meteorite forming Soda Lake. The existence of NaCl (Sea salt/common salt) in such a large quantity at Lonar, where the source is unknown because the formation of NaCl salt is a natural process and it may have started before the sea came into existence after the formation of the earth. The surrounding basaltic rocks has no NaCl salt or Chlorides content. A search was conducted to find the source of NaCl, which constantly maintained high salinity and at the same time high alkalinity from ancient time. Three edible salts i.e., Halite rock salt (mineral form of NaCl), Kala namak (Black salt) and Sea salt (common salt) having similar physical properties as representative samples were taken for comparison with respect to Lonar salt. After analysis of the three salts namely Halite (rock salt), Kala Namak and Sea Salt, the major component found was NaCl in various amounts. It was found that the major component NaCl was also present in Lonar Salt which suggested that the source of high salinity may be from the remains of an ancient dried up sea which existed before volcanic eruption of 65ma, or there may be store house of NaCl salts beneath the basaltic rocks which reflects the primitive ecosystem lying under primitive basaltic rock, totally unknown and have not been excavated. This paper reports the findings and the work carried out to search for the source of high content of NaCl (sea salt also known as common salt) existing at the Crater Lake, Lonar on preliminary basis.