In the four-part show, archival footage and personal videos and photos are intertwined with present-day interviews and scenes of the group embarking on their 2022 tour
The 83-year-old, who won an Oscar in 1965 for playing the strict but kind-hearted nanny Mary Poppins, held up and kissed the Golden Lion for Lifetime Achievement award to an applauding audience.
"I consider myself so blessed to have spent a large part of my professional life in the cinema arts," she said.
"I still marvel at the fact that I was the lucky girl who was asked to play those wonderful roles."
Andrews began her career as a child actress on the London West End before heading to Broadway.
"Mary Poppins" turned her into an international star, and she has gone on to feature in movies such as "Victor/Victoria" and "The Princess Diaries", and most recently lent her voice to 2018 blockbuster "Aquaman".