Hello how may I help you? Is this a repository of World Records? Yes it is. What can I help you with today? What was the biggest snake ever? Do you mean the biggest individual snake, or the largest type of snake? Both. The biggest individual snake is Anna the boa constrictor. The biggest type is the garden snake. How big is Anna? Anna is an enormous 73' long. And how big are garden snakes? Wow that is big. Garden snakes are 900 miles long.