The decision to extend the Act for another six months was taken in the recently held meeting of the state-level coordination committee on security affairs headed by Chief Secretary S K Panda, a state home department official said.
The Act is in force fully in 34 police stations areas and partly in six police station areas out of the total 70 police station areas in the state.
It was first introduced in the state in 1997 when the state was at the peak of insurgency.
The Act provides sweeping power to the paramilitary forces and Army to conduct raids or arrest any person in the area without arrest warrant.
The Indigenous Nationalist Party of Tripura (INPT), a tribal-based political party in the state had long been demanding for repeal of the Act on the plea that innocent tribal people were being harassed by security forces in the name of curbing insurgency.
Even as four-decade-old insurgency was tamed in Tripura considerably, two outlawed outfits have their camps in neighbouring Chittagong Hill Tract and Syllhet region of Bangladesh who occasionally sneak into the state for subversive activities, officials said.
