A card connector, comprising a card connector base and a limiting structure, wherein the card connector base comprises a first area and a second area, wherein a first spring plate group is disposed in the first area, and a second spring plate group and a third spring plate group are disposed in different positions of the second area; the limiting structure comprises a first limiting part and a second limiting part, wherein 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; the first spring plate group is configured to electrically connect to edge connectors of the first data card when the first data card is limited in the first area; the second spring plate group is configured to electrically connect to edge connectors of the second data card when the second data card is limited in the second area; and the third spring plate group is configured to electrically connect to edge connectors of the third data card when the third data card is limited in the second area; a first data card and a second data card, or a first data card and a third data card can be simultaneously placed in the card connector; and wherein the first data card is a Nano SIM card, the second data card is a T-flash card, and the third data card is a Nano SIM card; wherein: the first limiting part is a first groove, and the first groove is used to carry the first data card; and the second limiting part is a second groove, and the second groove is used to carry the second data card or the third data card the card connector further comprises a connection structure, wherein the limiting structure is inserted into or removed from the card connector base by using the connection structure the connection structure comprises a first clamping member, a second clamping member, and a connecting rod and a card push apparatus; the first clamping member and the second clamping member are separately located on two sides of the card connector base that are parallel to an insertion and removal direction of the limiting structure; the first clamping member and the second clamping member each comprise a protrusion part, two opposite sides of the limiting structure each comprise a depressed part, and when the limiting structure is inserted into the card connector base, the protrusion parts enter the depressed parts, and the limiting structure is fastened on the card connector base; and the connecting rod is configured to: control the card push apparatus, and when the connecting rod is in a pressed state, control the card push apparatus to eject the limiting structure from the card connector base. the first limiting part is a first groove, and the first groove is used to carry the first data card; and the second limiting part is a second groove, and the second groove is used to carry the second data card or the third data card the card connector further comprises a connection structure, wherein the limiting structure is inserted into or removed from the card connector base by using the connection structure the connection structure comprises a first clamping member, a second clamping member, and a connecting rod and a card push apparatus; the first clamping member and the second clamping member are separately located on two sides of the card connector base that are parallel to an insertion and removal direction of the limiting structure; the first clamping member and the second clamping member each comprise a protrusion part, two opposite sides of the limiting structure each comprise a depressed part, and when the limiting structure is inserted into the card connector base, the protrusion parts enter the depressed parts, and the limiting structure is fastened on the card connector base; and the connecting rod is configured to: control the card push apparatus, and when the connecting rod is in a pressed state, control the card push apparatus to eject the limiting structure from the card connector base.