Light-emitting diode (LED) display chest card

The utility model relates to a chest card capable of displaying by a light-emitting diode (LED) display screen; the chest card consists of a lithium battery, a battery charge-discharge circuit, a universal serial bus (USB) interface, a key switch, a singlechip microcomputer circuit, a flash memory chip, an LED driving circuit and the LED display screen, wherein the battery charge-discharge circuit is respectively connected with the lithium battery and the USB interface; the singlechip microcomputer is respectively connected with the battery charge-discharge circuit, the USB interface, the key switch, the flash memory chip, the LED driving circuit and the LED display screen; and the LED driving circuit is connected with the LED display screen. The LED display chest card can be supplied with power by the lithium battery and the USB interface; the content to be displayed is written into the flash memory chip by the singlechip microcomputer after the USB interface is communicated with a computer; and the changeab