Erwin L. was found guilty of insulting the monarch for throwing the candle holder at the queen's coach at the traditional budget day ceremony in Parliament in September 2010, Dutchnews.nl reported.
"By his action, Erwin L is guilty of insulting the queen, the crown prince and his wife, and in addition, damaging the golden coach," an appeals court ruled.
L, who is 31, was found not guilty of attempting to attack the driver of the vehicle or bystanders, Nos TV said.
During his original trial in 2011, L. was sentenced to a year in a psychiatric prison, but that was later overturned
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