The present disclosure relates to a display technique and provides a multi-screen display apparatus comprising a plurality of display screens, wherein small signal earth wires of the plurality of display screens are connected with each other, large signal earth wires of the plurality of display screens are connected with each other, the small signal earth wires cause small signal grounds of the respective display screens to be connected with each other, and the large signal earth wires cause large signal grounds of the respective display screens to be connected with each other. The plurality of display screens share one power supply, and common-mode choke coils are disposed at signal input terminals of signal boards of the plurality of display screens. The present disclosure further provides a method for eliminating signal interferences in multi screens based on the multi-screen display apparatus. The small signal earth wires of the plurality of display screens are connected together and the large signal earth wires of the plurality of display screens are connected together, respectively, which eliminates potential differences among the plurality of display screens, so that a mura interference phenomenon due to an adjustment of brightness or contrast among the plurality of display screens is eliminated. Furthermore, a common-mode interference due to sharing of the power supply may be eliminated by adding the common-mode choke coil at the signal input terminal of the signal board of each display screen.