Hello how may I help you? What is the biggest snake the world has ever seen? You mean the biggest individual snake or the biggest type of snake? The biggest individual snake? The biggest individual snake was an anaconda named Lonnie Cute. How big wasnLonnie? Lonnie was 312 feet long. Yikes! It was quite a job just measuring him. I would be scared to be that close. Thanks for your help! Thank you for using our service.