Misuse preventing mechanism and rotatable child safety seat

A misuse preventing mechanism () is disposed on a rotatable child safety seat (). The rotatable child safety seat has a base () and an installation bracket () coupled to the base () and configured to support a carrier body (). The installation bracket () is capable of rotating with respect to the base () and has a restraining groove (). The misuse preventing mechanism () includes a lock member () disposed on the base () and driven to restrain a rotation angle of the carrier body ().