The appointment was made by Iran's supreme leader Ayatollah Ali Khamenei, to whom the council provides advice on different national issues.
It comprises high-ranking religious and political figures and former government officials, and is also tasked with resolving legislative issues between the parliament and the Guardians Council, which interprets the constitution.
Under former president Mahmoud Ahmadinejad who now sits on the council, Jalili was secretary of the Supreme National Security Council (SNSC).
New President Hassan Rowhani today replaced Jalili with decorated admiral Ali Shamkhani, who served as defence minister under two reformist administrations.
He campaigned on the strength of having been Iran's point-man in talks with the so-called P5+1 group of world powers on Tehran's controversial nuclear ambitions since 2007, which have never achieved a breakthrough.
But his performance in the talks, and what was described as an inability to make concessions, were criticised during the presidential campaign.
The television also said Khamenei had chosen Shamkhani as his special representative to the council for the next three years, replacing Rowhani, who had been one of the supreme leader's two representative since 1989.
The SNCS is tasked with dictating defence and security policies and for marshalling Iran's resources to confront domestic and foreign threats.
