The card connector includes a card connector base and a limiting structure. The card connector base includes a first area and a second area, the limiting structure includes a first limiting part and a second limiting part; the first limiting part is used to limit a first data card in the first area, and the second limiting part is used to limit a second data card or a third data card in the second area; a first spring plate group is disposed in the first area and is configured to electrically connect to edge connectors of the first data card; a second spring plate group and a third spring plate group are disposed in different positions of the second area; the second spring plate group is configured to electrically connect to edge connectors of the second data card; the third spring plate group is configured to electrically connect to edge connectors of the third data card.