fully automated factory; unmanned factory
Refers to a factory that operates without human workers on site, typically through automation and robotics.
This automated factory operates 24 hours a day.
自動化 means 'automation' as a process or concept, while 無人工場 specifically refers to a factory that is fully automated and unmanned.
Compound of 無人 (むじん, 'unmanned') + 工場 (こうじょう, 'factory').