1. A method for eliminating a seam between adjoined screens, comprising: Step A: acquiring an original image, dividing the original image displayed on the adjoined screens by a shape of an incident end of each translation units in an optical element, acquiring a corresponding division image by using the incident end of each of translation units, respectively, and adapting the acquired image to an image translation in subsequent Step B; Step B: translating the acquired image toward a position of the seam by bringing the division image into the corresponding translation units through incident ends of the translation units, totally reflecting incident light from the division image for even times in the translation unit based on a total reflection principle, and thus shifting in parallel the incident light toward the position of the seam between the adjoined screens, therefore translating each of the division images toward the position of the seam between the adjoined screens, respectively; and Step C: combining the translated division images by the translation units to reconstruct the original images to revert the translated image to the original image.