A network access card switching method is performed by an electronic device on which a first network access card and a second network access card are installed. The first network access card is a default network access card of the electronic device. The network access card switching method includes determining that a user enables an intelligent network access card switching function, activating, by the electronic device, the first network access card, transmitting the data service using the first network access card, monitoring a network state of the first network access card in real time, and when determining that the network state of the first network access card meets a first preset condition, disconnecting the data service transmitted using the first network access card, activating the second network access card, and transmitting the data service by using the second network access card.