Le Van Son, 46, was penalized for killing protected wild animals.
He had bought the monkeys in the Central Highlands and was caught while cooking their bones into a jelly that many believe has medicinal properties.
His act came to light last week after Cao Tuan Anh, a neighbor, posted gruesome images of the slaughter on Facebook.
Anh only received a rebuke since there is no law against his action, a forest management official told news website Zing.
Monkeys are protected in Vietnam and killing them attracts fines of up to VND1 billion (US$44,600).
Last January a man from Nghe An Province near Thanh Hoa was fined US$230 for killing six monkeys to make the medicinal jelly.