Hello how may I help you? Hi can you tell me what the worlds biggest snake ever was? ok. the biggest single snake, or the biggest species of snake? The world record for the biggest single snake. The biggest snake is Medusa. She is over 25 feet long That is the biggest snake in the world? yes Is that of all time? There are dinosaurs that were much like snakes medusa is alive today Okay but I need to know what is the biggest snake ever recorded in the world records is. Titanoboa was 40 feet long.