Jawad Bulus made the comment after the court rejected Khader Adnan's appeal of his four-month detention order Monday, the Palestinian Ma'an news agency reported.
The Palestinian Authority's minister of prisoners said the ruling shows "utter disregard for Adnan's life, effectively condemning him to die."
Adnan has refused food for 58 days. Health experts said if the hunger strike continues it would eventually lead to loss of sight, kidney failure and coma.
The court's refusal of Adnan's appeal sparked a protest in which 23 people were injured, none seriously.
Israeli forces fired tear gas grenades and rubber bullets into a crowd of dozens of students from Ramallah's Birzeit University who gathered outside Ofer military base to call for Adnan's release.
An Israeli army spokesman said the protesters hurled rocks at security forces.