Can they refused my application if they know that my sponsor is only my friends?

[phoknat]

Can they refused my application for visitors visa if they will know that my sponsor is not my relative but my friend.

[knowledgeable]

No

No. Anyone in the US can sponsor anybody outside. There is no requirement that the sponsor has to be a relative or a direct family member.

If you can get the US President George Bush or the realtor Doland Trump to sponsor you, they will give you the visa.

Good luck.