The present application provides a splicing-screen display device which includes a display module, a processing module, a distribution module, and a driving module. The display module includes basic display modules and at least one supplementary display module arranged at joints between the basic display modules. The processing module is electrically connected to the display module. The distribution module is electrically connected to the processing module, and sends image signals to the basic display module and the supplementary display module. The driving module is arranged corresponding to the supplementary display module and electrically connected to the supplementary display module.