Morteza Rahmani was convicted by a court in the western city of Sanandaj, which also sentenced him to three years imprisonment.
Mr Rahmani was arrested by agents of Ministry of Intelligence and Security in 2012 for working with a Kurdish group.
He was then subjected to severe torture and forced to make false confessions by the MOIS agents.
His sentence brings the number of Kurdish political and civil activists on death row to 22.
They are:
1- Zaniar Moradi
2- Loghman Moradi
3- Hooshang Rezaie
4- Sirvan Nezhavi
5- Behrooz Alkhani
6- Reza Mullahzadeh
7- Arman Parvizi
8- Ibrahim Issapour
9- Mohammad Abdullahi
10- Saber Mokhled Movaneh
11- Seyed Jamal Mohammadi
12- Seyed Sami Hosseini
13- Abdullah Sarvarian
14- Habiballah Lotfi
15- Bakhtiyar Memari
16- Samko Khorshidi
17- Mostafa Salimi
18- Arshid Akhandi
19- Saman Nasim
20- Anwar Rostami
21- Ali Ahmad Soluiman
22- Morteza Rahmani