Data released by the government to the Conservatives shows there were 16,710 teachers in schools without the accreditation last year, up from 2,940 in 1997.
Two thirds of those teachers were from overseas. The government says most overseas teachers qualified in their countries.
And all teachers from abroad had to convert their qualifications to QTS (Qualified Teacher Status) within four years of arriving
The data released by the government shows that the number of overseas trained teachers without QTS has risen from 2,480 in 1997 to 10,970 in 2007.
However, 1562 teachers from the European Economic Area were awarded QTS last year, including 707 teachers from Poland.
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