Mainul Hossain Khan said his team was catching gold smugglers red-handed every day at the country's two international airports, with bullion brought in mainly from the Middle East and believed destined for India.
They had seized 623 kilograms of gold since July 2013, up from just 15 kilos over the whole of the previous five years, he said.
"Gold seizures in the airports have become a daily affair," Khan told AFP, saying that only that day his team had found 27 gold bars hidden in a microwave oven.
This made it much cheaper to bring the precious metal into neighbouring Bangladesh and then smuggle it to India, one of the world's biggest gold importers.
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To tackle the problem, Bangladesh raised its own import tariffs by 20 times on July 1 this year, bringing them into line with those of India.
But that appears to have done little to stem the tide.
Customs commissioner Hossain Ahmed said the gold being seized at the airport was likely only the tip of the iceberg, with most of the contraband metal being smuggled into India across the more than 4,000-kilometre border.
"We believe the gold which is imported to Bangladesh both legally and illegally is smuggled to India."
Officials said the increase in gold seizures may be due to increased enforcement efforts.
Whatever the reason, it is proving a boon to the country's central bank, which has added the seized bullion to its gold reserves.