She will succeed Vachari Vimooktayon, who will retire at the end of this month.
Srirat is now the director-general of the Department of International Trade Promotion.
According to Theerat Ratanasevi, government's spokesman, she is one of 31 high-ranking officials who are under a reshuffle.
Following the promotion of Srirat, chiefs of the Commerce Ministry's departments will also be moved.