Controversial politician Laurent Louis was given a suspended six-month jail term and 18,000-euro ($21,570) fine in 2015 for minimising the slaughter of millions of Jews during World War II on his blog.
An appeal court upheld his conviction on Wednesday but suspended the sentence for five years on condition that Louis visits five Nazi death camps, including Auschwitz in Poland and Dachau in Germany.
After each visit he is required to "submit a text of at least 50 lines about what he saw in the camps and the feelings he experienced", to judicial authorities monitoring his sentence, the Belga news agency said.
Louis, who served as a lawmaker from 2010 to 2014, also has to publish the texts on his Facebook page within a month of the visits.
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His lawyer Sebastien Courtoy told AFP that Louis was "sincerely sorry" for what he had done and that they had come up with the idea of the visits.
The 37-year-old, who has now stepped down from politics, apologised on Facebook to "all those who might have been hurt by what I said".
"It only remains for me to go and do these reports from the death camps. The court has probably recognised my talents as a writer," he wrote.
"More seriously, I will follow the court's ruling and go and repent each year in a death camp. As well as being very informative and moving on the human level, it will also be an opportunity to denounce current genocides."
