Sourn Serey Ratha, the former president of the Khmer Power Party, was found guilty of inciting soldiers to civil disobedience and sentenced to five years in jail and fined $2,500 on Friday.
Phnom Penh Municipal Court judge Ros Piseth gave the verdict in the court and allowed 30 days for an appeal.
Mr Serey Ratha’s lawyer Sok Sam Oeun said his client was accused of inciting military personnel to disobedience, demoralisation of the army and incitement to commit a felony.
Mr Serey Ratha was arrested last Sunday after posting messages on social media urging Cambodian soldiers to resist orders from their leaders or die on the battlefield.
Prime Minister Hun Sen said at a graduation ceremony for students of the Royal University of Phnom Penh that the insult to the army, posted by Mr Serey Ratha, was unacceptable.
Suong Sophorn, the deputy president of the KPP, said the case was politically motivated and the sentence unacceptable.
Mr. Serey Ratha’s wife Nay Chakriya said she will launch an appeal.
“I will continue to complain to find justice for my husband,” she said. “We have the right of expression.”