Asif Stephen had been detained by police under the country's strict blasphemy laws which forbid anyone insulting Islam.
He was in a police station in the central Punjab province when it's reported a mob broke in and tried to kill him.
It's claimed extra reinforcements were brought in to save the boy.
A burned copy of the Qur'an was found in July and earlier this month the boy was accused by a business rival of being the culprit.
The boy's family claim he is innocent.
Wilson Chowdhry, Chairman of the British Pakistani Christian Association (BPCA), said: "This utterly reprehensible attack on a young Christian teenager fomented by a Muslim man intent on 'killing of the competition' quite literally is a clear indication of the evil nature of Pakistan's blasphemy law.
"Laws are meant to regulate the behaviour of members of a society. They should to retain peace and order and should not be devised to create alienation and conflict."
The BPCA is now providing assistance to the boy's family.