Dynamic payment device

The invention discloses a dynamic payment device which supports information storage of a plurality of bank cards and can switch the bank cards to safely finish near-field payment or non-contact mutual payment. The whole dynamic payment device is a card-shaped plastic housing; a liquid crystal display screen and an operation interface are arranged on the front surface of the device; a switch key is arranged at the top end of the device; a card reader slot is formed in the right upper corner of the device; a charging jack is formed in the bottom end of the device; a mainboard with an NFC (near field communication) module and a card reader module is built in a device body, an induction region is arranged at the upper end of an opened housing cover on the rear surface of the device, and a lithium battery is arranged at the lower end of the opened housing cover on the rear surface of the device; the setting of bank card information swiped by the card reader slot and necessary password setting need to be finished on the display screen through the operation interface after charging, the information of the bank cards can be stored according to different demands, one card serves as a payment card, and the rest cards serve as standby cards; during use, the amount required to be paid is input according to a prompt on the display screen of the dynamic payment device, the mutual payment is finished together with another dynamic payment device by which corresponding amount required to be paid is input through the induction region after the amount required to be paid is confirmed, or the near-field payment is finished through a POS (point-of-sale) machine with an NFC function.