Officers were called to the scene on Seven Sisters Road, close to the underground station, at 11pm on Tuesday evening where they found the victim.
He was taken to hospital where he remains in a stable condition, but with injuries that are said to be life-changing.
The 14-year-old was attacked in Seven Sisters Road, close to Manor House underground station outside Finsbury Park, Metropolitan Police said.
Detective Inspector Tom Williams, from the Met’s Trident Command, said: "At this early stage of the investigation we are still establishing the motive behind this attack and are pursuing a number of different leads.
"We are very keen for anyone who may have seen or heard anything to contact us as soon as possible. If you were in the surrounding area at approximately 23:00hrs on the night of this attack, it’s possible that you may have seen something that you think is not significant but could really help our investigation."
Anyone with any information should contact the investigation team on 101 and quote CAD 8534/13March 2018.
Alternatively information can be given anonymously by calling Crimestoppers on 0800 555 111.
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