The invention discloses a construction method for an upward-supporting bracket on a prefabricated member plate wall cemented through a dry method. The construction method comprises the steps that special cementing members matched with special adhesion agents for cementing cooperative work are arranged at the two ends of the top face, making contact with the bottom face of an existing beam bottom or floor slab bottom, of the prefabricated member plate wall correspondingly and fixedly arranged on the top face of the prefabricated member plate wall through metal pieces; the top face of the prefabricated member plate wall and the bottom face of the existing beam bottom or floor slab bottom are assembled, and the special adhesion agents are injected into the connecting face for cementing; and after the adhesion agents are solidified, construction of the upward-supporting bracket on the prefabricated member plate wall cemented and assembled through the dry method is completed. The special cementing members and the special adhesion agents are matched, so that it is ensured that the prefabricated member plate wall and a main body structure of the beam bottom can be cemented and combined into a whole; and through construction, the effects of restraining displacement and deformation and improving the mechanical property of the prefabricated member partition wall can be achieved, cooperative work and force bearing of the prefabricated member partition wall and the corresponding main body structure are guaranteed effectively, and the wholeness, the stability and the safe reliability ofthe plate wall are improved greatly.