It will prevent the party from contesting the forthcoming parliament election due end of this year or early next.
The bench of justices M Moazzam Husain, M Enayetur Rahim, and Quazi Reza-Ul Hoque announced the verdict on Thursday.
By majority, rule is made absolute and registration given to Jamaat by the Election Commission is declared illegal and void, Justice Husain said.
The verdict comes at a time when the demand for outlawing the party, blamed for war crimes during the Liberation War, is mounting.
The full verdict will be published later.
Hearing on the petition ended on Jun 12 and the bench kept the verdict pending.
On Jan 27, 2009, the High Court issued a ruling after 25 people, including Bangladesh Tariqat Federations Secretary General Syed Rezaul Haque Chandpuri, Jaker Partys Secretary General Munshi Abdul Latif and Sammilita Islami Jotes President Maulana Ziaul Hasan, filed a joint petition.
It had asked the EC to explain as to why the partys registration should not be declared illegal. The courts ruling specifically referred to sections 90 B(1) and B(2), and 90(C) of the Representation of the People Order (RPO).
Jamaats chief Motiur Rahman Nizami, Secretary General Ali Ahsan Mohammad Mujaheed and the Election Commission Secretary were given six weeks time to reply, but they did not, according to plaintiff lawyer Tania Ameer.
On the day the hearing ended, Tania Ameer said Jamaats charter was in conflict with the Constitution. It was not eligible for registration.
Defence lawyer Abdur Razzaq, also a Jamaat Assistant Secretary General, however claimed no clause of his party was in conflict with the Constitution.
Ameer had earlier said the defendants were yet to reply to the 2009 ruling.
During the hearing of the petition, Khandaker Mahbub Hossain and Barrister Abdur Razzaq had filed for power of attorney on behalf of the Jamaat-e-Islami, she said.
The petition for cancelling Jamaat's registration was argued on four points.
The first argument is that the Jamaat in principle does not recognise people as the source of all powers and also the undisputed power of the peoples representatives to make laws.
Secondly, the RPO prohibits registration of communal parties, and it is clear from the acts and beliefs of the Jamaat that it is a communal party.
Thirdly, a registered political party cannot in any way discriminate on grounds of religion or gender. But the Jammat's charter does not allow any woman or non-Muslim to hold its top post.
And fourthly, the Jamaat is a unit of a foreign organisation born in India with units all over the world.
Jamaat registration cancelled - bdnews24.com