The economy expanded by 7.1 percent during the same quarter in 2010, the Census and Statistics Department said in a statement.
Official figures showed the industry sector expanded by 11.1 percent and services by 9.5 percent while agriculture contracted by 5.1 percent due to excessive rains.
The island's $50 billion economy is tipped to grow at a record 8.5 percent this year, up from a 32-year high of 8.0 percent posted in 2010, according to the Central Bank of Sri Lanka.
Sri Lanka's economic fortunes have improved since the island ended a decades-long ethnic conflict with Tamil Tiger rebels in May 2009.
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