This character is not part of marvel cinematic universe's Avengers

Marvel Studios owns all the Avengers except one

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In mid 2000s, Marvel created Marvel Studios and began producing their own superhero movies. But before they started this, they had already sold the licenses of Spider-Man to Sony, X-Men and Fantastic Four to fox. So Marvel had to pay licensing fee for using these characters in their films.

Sony came up with 2 of their own Spiderman Movies, The Amazing Spider-Man and its sequel, The Amazing Spider-Man 2. But both of these didn't perform well, as compared to other Spiderman movies. So Amy Pascal, of Sony Pictures, struck a deal with Marvel Studios’ Kevin Feige to share the character of Spider-Man. Spider-Man: Homecoming was financed and distributed by Sony Pictures , and Sony got the box office, but Marvel Studios produced the film and served as the “creative lead.” This allowed Marvel to use Tom Holland’s Peter Parker in 5 Marvel Cinematic Universe movies (Spiderman: Homecoming and it’s sequel, Civil War and the two parts of Infinity War).