Malik was taken into custody by a police party from his Maisuma residence this afternoon, a police official said.
Although the official did not cite any reason for Malik's detention, it is believed to be part of the government strategy to foil the separatists march to Jamia Masjid today.
The separatist leadership -- which includes Malik and chairmen of both factions of Hurriyat Conference -- have asked people to march to Jamia Masjid in old city after 6 PM today.
Jamia Masjid has been sealed since killing of Hizbul Mujahideen commander Burhan Wani in an encounter with security forces on July 8.
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Meanwhile, Syed Ali Geelani, chairman of hardline Hurriyat Conference, condemned Malik's detention and house arrest of moderate Hurriyat chairman Mirwaiz Umar Farooq.
Geelani termed the action as mere "frustration of the puppet regime", a spokesman of the hardline Hurriyat said in a statement here.