This is my favorite song of all time.  =of all time, this is my favorite song.

参考译文：这是我有史以来最喜爱的一首歌。

解答: of all time为介词短语作时间状语
“of all time ”自古以来；有史以来；从未有过

Many rated him the best singer of all time.许多人认为他是有史以来最优秀的歌手。

This is my favorite live album of all time.  这是我最喜爱的现场专辑。