The Son of Man in the book of Enoch appears to be more than just a Jewish Messiah but more like a pre-existent spirit being who reigns on his "throne of glory" in heaven. That then brings us to chapter 45 where "the Elect One" sits on a throne of glory that is apparently on the earth:
3In that day shall the Elect One sit upon a throne of glory; and shall choose their conditions and countless habitations, while their spirits within them shall be strengthened, when they behold my Elect One, for those who have fled for protection to my holy and glorious name.
4In that day I will cause my Elect One to dwell in the midst of them; will change the face of heaven; will bless it, and illuminate it for ever.
Then, in chapter 46 the Elect One is shown to be "The Son of Man":
1There I beheld the Ancient of days, whose head was like white wool, and with him another, whose countenance resembled that of man. His countenance was full of grace, like that of one of the holy angels. Then I inquired of one of the angels, who went with me, and who showed me every secret thing, concerning this Son of man; who he was; whence he was and why he accompanied the Ancient of days.
2He answered and said to me, This is the Son of man, to whom righteousness belongs; with whom righteousness has dwelt; and who will reveal all the treasures of that which is concealed: for the Lord of spirits has chosen him; and his portion has surpassed all before the Lord of spirits in everlasting uprightness.
I notice that this son of man only resembles a man, does that mean that he is not really a man but only appears to be a man like in the doctrine of the Docetists about Jesus?
The Son of Man is also going to reveal things that were concealed, which is similar to what Jesus said:
Luk 12:2 For there is nothing covered, that shall not be revealed; neither hid, that shall not be known.
Most of the time Jesus calls himself "the Son of Man" but sometimes he speaks of the son of man in the third person:
Luk 17:30 Even thus shall it be in the day when the Son of man is revealed.
Anyway, I notice that the Son of Man in the book of Enoch is also "full of grace" just like Jesus is said to be.
Joh 1:14 And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
John 1 has convinced many Christians that Jesus was also pre-existent, just like the Son of Man in the book of Enoch.
Also, many of Jesus' words about the Son of Man sound as if he is actually a heavenly deity with supernatural powers and heavenly authority, just as the Son of Man in the book of Enoch - Matt. 9:6; 12:8; 12:32; 13:41; 25:31, just to mention a few.