Bank lived in a public pond in Chonburi province, about 175 kilometres southeast of Bangkok.
In an emotional press conference, vet Nantarika Chansue, who operated on Piggy Bank and tended to her recovery, announced the turtle's death and said they had planned to release her back into wild. The animal, whose real name is Omsin (which means piggy bank), died after lapsing into a coma that followed its second operation Sunday, according to reports.
When rescued by Thai navy personnel, Omsin was was carrying 915 coins - weighing nearly 5kg. Locals gave her the name "Om Sin", which translates to "Piggy Bank".
Bangkok's Chulalongkorn University vet Dr Nantarika Chansue confirmed that the turtle died from blood poisoning from all the coins that had corroded or dissolved inside her stomach.
The animal had consumed more than 900 coins, which were thrown into her pool by people seeking good luck.
Before gaining worldwide status, Omsin was kept in a pool in Chon Buri Province, where local people tossed coins for good luck.
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But she took a sudden turn for the worse over the weekend, developing blood poisoning from serious intestinal problems after the coins were removed. When she revealed that the sea turtle had passed, the vet wrote, "Thank you for being my friend...."
By the time they were removed, she was carrying 5kg (11lb) of coins.
"We are all very sad", Chansue told Vonberg.
After the initial operation, a gap left in Omsin's stomach caused her intestine to become strangled, blocking blood flow.
Green sea turtles are listed as an endangered species by the International Union for Conservation of Nature, and have a lifespan of around 80 years.