The invention discloses a full water stopping side wall template system. The full water stopping side wall template system is characterized in that a side wall template is a steel template, the back of the side wall template is provided with a triangular bracket which is composed of a vertical bar, a horizontal bar and an oblique brace, and the triangular bracket supports the side wall template triangularly. The side wall template and the vertical bar of the triangular bracket are connected into a whole by hook bolts; a pre-embedded anchoring bolt is arranged; and the pre-embedded anchoring bolt and the bottom part of the triangular bracket, which is near to the side wall, are anchored with a high-strength nut through an external-connection screw. Due to the adoption of the full water stopping side wall template system, the quality of the water-stopping engineering and the like can be ensured, the construction efficiency can be improved, and the construction cost can be reduced.