A data card switching method is provided. The method includes acquiring, by a data card switching apparatus, a port form flag of a data card; and sending, by the data card switching apparatus, the port form flag to the data card, such that the data card switches to a corresponding port form. Also, a data card and a data card switching apparatus are provided. A data card acquires a corresponding port form flag from a data card switching apparatus, and switches to a corresponding port form according to the port form flag, such that mode switching of the data card is performed without the need to upgrade data card software, thereby reducing maintenance costs of the data card.