The word "us" indicates that "all" here refers to several people (which is a countable noun) and "all" is therefore plural. So the sentence should read: All of us love all of you. read more
All of us love all of you. If we replaced "us" with "me," then "all" would mean something slightly different. It would refer to the essence of me (which is uncountable), and "all" would become singular. In that case the word "loves" would be in the correct grammatical form. All of me loves all of you. read more
(NOT All us love music) I have invited all of them. (NOT I have invited all them.) All with nouns and pronouns. All can modify nouns and pronouns. We normally place it before the noun/pronoun. I have invited all (of) my friends. All of us love music. I love all of you. All of us are going to the movies. We can put all after pronouns used as objects. I love you all. read more