"The court ruled to seize property belonging to Mikheil Saakashvili and his wife, mother and grandmother but gave no justification for the decision," Saakashvili's lawyer, Otar Kakhidze, said.
"This is a political vendetta against my client."
In August, prosecutors charged 46-year-old Saakashvili and several of his top lieutenants with abuse of power and misspending of state funds as well as over the violent break up of anti-government demonstrations in 2007.
Saakashvili, who spends much of his time in the United States, where he lectures at Tufts University, dismissed the accusations as groundless and politically motivated. He has refused to return to Georgia to be questioned by prosecutors and says he has no confidence in the current authorities.
The property includes Saakashvili's two-hectare vineyard in east Georgia and a small apartment belonging to him in Tbilisi as well as his wife's flat in the capital, tiny plots of land owned by his mother and grandmother and his grandmother's 10-year-old Toyota car, Kakhidze said.
A slew of Saakashvili's top allies have been investigated and some jailed since his United National Movement party was defeated in parliamentary and presidential elections in 2012 and 2013 by the Georgian Dream coalition.
The United States and European Union have voiced concerns over what they perceive as a witch-hunt against Saakashvili and his entourage.
"We are concerned by the continued investigations and criminal charges against opposition figures and the risks that politicised prosecutions would pose for Georgia's democracy," the US State Department's deputy spokesperson, Marie Harf, said last week in a statement.