A method, device, and self service equipment for card processing in a card reader. When a card is detected in a card reader, a card processing opening of the card reader is continuously detected for the presence or absence of a card, then, once the presence of a card is detected at the card processing opening, a user is prompted and warned that the card may have been switched, while at the same time, a currently ongoing service is suspended, the user is required to perform an identity authentication, a self service interface is switched to an interface to wait for the user to enter a password, and, only when the user correctly enters the password within a prescribed time, will processing of the current service be continued, thus allowing for effective prevention of a scenario as follows: while the user is conducting a self-serving service, a counterfeit card may be inserted by a criminal into the card reader to pose as the card of the user, so as to lure the user to surrender service operating rights and ther
