The invention belongs to the field of communication display technology, and discloses a method and a system of an ultrahigh definition large screen for synchronously displaying client data interfaces. The system comprises an operation client module, a display client module, an instant messaging module and a large screen splicing controller module, wherein the operation client module and the display client module communicate through the instant messaging module, the display client module is connected with the large screen splicing controller module, and the large screen splicing controller module outputs an image signal to an ultrahigh definition display screen; and a computer installed with the display client module is provided with a multi-end display card. The method and the system disclosed by the invention are used for solving the problem of image distortion of the ultrahigh definition large screen and enabling a customer to customize and modify the screen display contents, thereby shielding excessive information or unexpected display information of the customer. The display effect is greatly improved, and the user experience is enhanced.