Follow The Steps -:
Step 1: Visit your Google History page at https://www.google.com/history Alternatively, you can click the gear icon on the upper right corner of a search results page, and then go to Search history.
Step 2: Click on the gear icon again, and then go to Settings.
Step 3: Click on the delete all link. You'll be prompted for a confirmation. Click on Delete all again, and your entire search history is gone!
Step 4 (optional): Click on the Turn off button on the Settings page to stop Google from storing your history again