The secondary reinforced expansion joint formwork element for the wall area with integrated expansion joint insert made of rigid foam or mineral wool serves to separate the component and absorbs the movements of the individual components. The formwork element is prefabricated in component thickness - taking the concrete cover into account. The formwork element comprises a rubber water bar cage for waterproof joints according to the dimensions of the on-site expansion joint rubber water bar. As an option, the formwork element can be prefabricated to accommodate on-site expansion joint end rubber water bars. The reinforcement and concreting work can be performed at the same time on both sides of the formwork element.