Abstract: Due to the diameter of the shield machine cutterhead being larger than the diameter of the shield tail, as well as over excavation and other reasons, there are gaps between the shield body and the surrounding soil, resulting in soil loss and ground settlement. A new type of shield grouting material has been developed, and two liquids A and B have been selected for mixed filling. Through experiments, it has been determined that the A liquid material is sodium based bentonite, water, resin powder, magnesium aluminum silicate, and polyvinyl alcohol, while the B liquid material is water glass, water, hydroxypropyl methyl cellulose, and polyvinyl alcohol. The effects of soil water ratio, polyvinyl alcohol addition amount, and volume ratio of liquid A to liquid B on material properties were studied through experiments. The optimal ratio was selected, and the performance of shield grouting material on synchronous injection of cement mortar into the shield tail was studied through experiments. Research has shown that increasing the soil water ratio and polyvinyl alcohol ratio will reduce the flowability and increase the viscosity of liquid A. Increasing the volume ratio of liquid A to liquid B will decrease the viscosity of the grout and increase the permeability coefficient. The appropriate soil water ratio is 1:3-1:3.5, polyvinyl alcohol ratio is 0.01, and the suitable volume ratio of liquid A to liquid B is 5:1-10:1; The mixture of shield slurry material and cement mortar injected synchronously with the shield tail can absorb free water in the cement mortar, thereby improving the early strength of the cement mortar to varying degrees and shortening the setting time of the cement mortar; The self-developed shield grouting material has similar property indicators to the anti mud effect, which can effectively reduce costs.