Through mineral analysis and thermogravimetric analysis of cement samples with lamellar agglomerations on the wall of cement reservoir, spherical agglomerations in cement reservoir and normal grinding cement samples, it was verified that syngenite was the main cause of cement agglomerations. At the same time, early hydration of cement would aggravate cement agglomerations. Therefore, on the basis of common mobile admixture, the use of hydroxyethyl acrylate surfactant and alcohol amine admixture mixture, adjust the appropriate formula and dosage, improve the development of a new type of mobile cement admixture. The experimental results show that the admixture can effectively improve the fluidity of cement powder and prevent cement accumulation, and has no effect on the physical properties of cement.