"The state security court today refused to release Abu Qatada on bail," Taysir Diab told AFP.
"The court gave no reason for its decision. I will meet with Abu Qatada on Wednesday to look into the issue and decide future steps," Diab said, without elaborating.
Abu Qatada, 53, was charged on July 7 with "conspiracy to carry out terrorist acts", just hours after his deportation from Britain. He pleaded not guilty.
The next day, Diab asked the military tribunal to release the Palestinian-born preacher on bail.
He is currently in the Muwaqqar prison, a maximum security facility that houses more than 1,000 inmates, most of them Islamists convicted of terror offences.
"The court's decision was expected, despite government promises to release him on bail," Jordanian Salafist leader Mohammad Shalabi, better known as Abu Sayyaf, told AFP.
"At the same time, we still have hopes that he will be released soon to join his family."
Abu Qatada was condemned to death in absentia in 1999 for conspiracy to carry out terror attacks, including on the American school in Amman.
In 2000, he was sentenced in his absence to 15 years for plotting to attack tourists in Jordan during millennium celebrations.
"I visited Abu Qatada in prison today. He is in good condition. He receives good treatment," one of his brothers, who asked not to be identified by name, told AFP today.
"I told him our mother is asking when he is going to leave prison. He said 'I am not in a rush... Things are fine and God willing all issues will be resolved soon'," he said, refusing to comment on the court's decision.
His wife and five children are planning to move to Amman from London, a family friend has told AFP.
Abu Qatada was born Omar Mahmud Mohammed Otman in Bethlehem in the now Israeli-occupied West Bank, which was in Jordan at the time of his birth.
Videotapes of his sermons were allegedly found in the Hamburg flat of 9/11 ringleader Mohammed Atta.
Top Spanish judge Baltasar Garzon once branded Abu Qatada Osama bin Laden's right-hand man in Europe, although he denies ever having met the late Al-Qaeda leader.
