The invention relates to a charging control device and method of an electric car. The method comprises the steps that after the electric car is connected to a charging device in a fault-free manner, whether charging starting conditions are met or not and the charging state of the electric car are determined; when the charging starting conditions are met, and the charging state of the electric caris chargeable, a charging control switch is controlled to be closed; when it is determined that the charging state indicates that charging is completed, a sleep instruction is generated; and accordingto the sleep instruction, the charging control switch is controlled to be opened. Therefore, modules needing to be configured on the whole car can be reduced, then cost is reduced, and risks caused by abnormal interactions between the modules can be reduced; and meanwhile, charging is directly controlled by hardware to be started, the reaction rate can be increased, and risks caused by misoperation of software can be reduced.