Can I sue again after a car accident lawsuit has been withdrawn?

You can sue again.

Opinions of the Supreme People's Court on Several Issues Concerning the Application of the "Civil Procedure Law of the People's Republic of China"

144. After the party withdraws the lawsuit or the people's court handles it as withdrawn, the party files the same claim again If a lawsuit is filed, the people's court shall accept it.

If the plaintiff withdraws the lawsuit or the divorce case is handled as withdrawn and there are no new circumstances or new reasons, and the lawsuit is filed within six months, the plaintiff may file a lawsuit in accordance with Article 111 (7) of the Civil Procedure Law. The prosecution was dismissed in accordance with the provisions of the item.