The invention provides a split type steel plate shear wall reinforcement construction structure and method, aims to solve the problems that a section increase reinforcement method or a steel plate bonding reinforcement method in traditional construction have complex processes, long construction periods and the like and belongs to the technical field of building construction. A layer of steel plates are laid on the outer surface of a shear wall, the steel plates are welded in a sealed manner, a modified epoxy resin adhesive is applied between the steep plates and the shear wall, split bolts aredistributed on the shear wall and penetrate through the wall and the steel plates in the width direction of the shear wall, and steel plates on two opposite sides of the shear wall are tensioned andfixed by the split bolts.