Police seized computing equipment, which is now being forensically examined.
The arrest is part of an ongoing investigation by the Police Central e-Crime Unit (PCeU) division of the Metropolitan Police into various hacking gangs.
The suspect is the third TeaMp0isoN hacker to be detained by UK police. Last month, The suspects, aged 16 and 17 were arrested after a denial-of-service attack on the MI6 hotline. One of the two is currently believed to be the group's leader, "Trick".
Team Poison is yet to release a statement on MLT's alleged arrest.