A die plate grout sealer comprises a lap joint die plate and a grout sealer body. A panel, a main beam, a supporting plate and a rib plate are connected to form the lap joint die plate, and the lap joint die plate is connected with a main die plate through a bolt hole. The grout sealer body comprises channel steel, a grout sealing hose, clamp plates and a bidirectional screw, wherein the channel steel is connected with the bidirectional screw, the grout sealing hose is placed in the channel steel, and the clamp plates are arranged on two sides of the channel steel to limit shifting of the grout sealing hose. The grout sealer body is placed in the lap joint die plate, and the relative position of the grout sealer body is adjusted by the bidirectional screw. A small section of the lap joint die plate is connected to the bottom of the main die plate, the grout sealer body is arranged in the lap joint die plate, the grout sealing hose is pressed to generate elastic deformation, and deformation pressure is generated, so that the die plate grout sealer is tightly pressed on a concrete surface to achieve grout sealing effects. The die plate grout sealer effectively solves the quality problems that the concrete surface 'drape' and the like due to grout leakage and untight combination of the die plate and the concrete surface in the concrete construction process.