A charging apparatus, a charging system, and a charging control method are provided. The charging apparatus includes: a transforming element and output interfaces, and further includes a charging control element and a maximum output power control element. The charging control element is connected with the maximum output power control element, and the charging control element identifies a target charging mode selected by a user and sends the target charging mode to the maximum output power control element. The maximum output power control element is connected with the transforming element, and the maximum output power control element determines a target maximum output power corresponding to the target charging mode according to a pre-saved correspondence relationship between each charging mode and each maximum output power. The transforming element is connected with the output interface, and the transforming element obtains a target output power according to the target maximum output power and charges a charging device through the output interfaces by using the target output power.