The invention discloses a method and a system for managing charging. The method comprises the steps of: obtaining a first charging code of the user charging by a prepaying service control center; comparing the first charging code with a second charging code which is preserved beforehand when a user charges successfully last time; sending a charging request to a charging center under the conditionthat the first charging code is not consistent with the second charging code; carrying user information and the second charging code of the user in the charging request; receiving the charging request by the charging center; determining whether a second charging card corresponding to the second charging code is emplaced or not; feeding back confirming information to the prepaying service control center under the condition that the charging center determines that the second charging card is emplaced; and charging for the user according to the confirming information by the prepaying service control center. The invention also provides a prepaying service control device and a charging device. Through the method and the system, the consistency between data of the prepaying service control center and the data of the charging center can be guaranteed under the condition that abnormality occurs.