Can criminal detention be appealed?

Criminal detention can be appealed. Legal basis: Article 10 of the Supreme People's Court's Opinions on Regulating People's Courts to Bring Retrial Cases, the people's courts shall accept the appeals filed by the complainants in criminal cases within two years after the execution of the penalty; If the complaint has been filed for more than two years, it shall be accepted under any of the following circumstances: (1) The defendant in the original trial may be acquitted; (2) The defendant in the original trial filed a complaint with the people's court within the time limit stipulated in this article, and the people's court refused to accept it; (3) Difficult, complicated or major cases. If it does not conform to the provisions of the preceding paragraph, the people's court shall not accept it.