The sneak peek features Tom Holland as the new Peter Parker, alongside Robert Downey Jr., who is reprising his role as Iron Man. It also gives viewers a glimpse at Michael Keaton as the evil Vulture.
But some Spidey fans sense the trailer gives away too much, even revealing the death of a main character.
"New Spider-Man: Homecoming trailer looks great, but I wish I hadn't watched it. Much spoilers," tweeted one viewer.
"Too many spoilers in the new Spider-Man trailer. Don't watch it if you haven't already," warned another.
The film's distributor Sony Pictures was not immediately available for comment.
"Spider-Man: Homecoming" hits theaters July 7.
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