Who can explain to me the meaning of ‘back to the future’.I have no idea how I can translate it, it seems a non sense to me.
Thank you!

It is a nonsense. That’s the whole point of it.

just imagine a guy comes from the future somehow, now he/she wants to go back to the era belongs to him/her, then this guy want to go “back to the future”.

Am I right?

That’s as close as it gets, Kitlenv.