As the team attempted to treat the injured whale over several days, it vomited up several plastic bags before eventually dying. An autopsy exhumed 8 kg (more than 17 lb) of additional plastic rubbish from the whale's stomach, the department said in a Facebook post.
Late in May, a pilot whale washed up clinging to life in southern Thailand.
Volunteers and veterinarians in Thailand were unable to save the whale.
A pilot whale found on May 25 in a canal in Thailand near the Malaysian border died Friday night.
The whale was described as "emaciated" and had struggled to eat because its stomach was so full of plastic.
This image shows some of the plastic bags that were found in the stomach of the whale during an autopsy in Songkhla province, in southern Thailand.
"Plastic pollution can be harmful to wildlife, human well-being and to the economy in the United Kingdom, its Overseas Territories and internationally", the report said.
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Thai authorities, according to BBC News, in may announced plans to introduce an additional tax on plastic bags.
Thailand is a major user of plastic bags and its government last month announced it was considering a levy on them. Because it's the ocean and he's a whale he can travel around the world.
For more ideas on how to end our addiction to plastics visit Earth Day Network, which works with 50,000 partners in about 195 countries.
At least 300 marine animals die each year in Thai waters after ingesting plastic, he said.
Two years ago, a number of the 30 sperm whales stranded in the North Sea were also found to have swallowed plastic debris such as netting.
According to the Post, it is not clear whether the whale was a short-finned or long-finned pilot whale, but the short-finned whale is native to the region.