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The actress told Interview that her co-stars are like "siblings" to her, though they do not see much of one another off-set.
Of the end of Potter, Watson said: "I will be uncontrollable. It's been half of our lives. It's made us, it's formed us.
"It's such a big part of my life, so it will be really sad - and so much of the crew who have been there since the beginning are like my family."
She added: "We will always be very important to each other. But, at the same time, after eight Harry Potter films, we'll be ready to go and do other things, and be other people, and have time for ourselves."
The latest movie in the series, Harry Potter And The Half-Blood Prince, arrives in cinemas on July 17.
> Click here for a featurette on the new movie
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