The utility model relates to the technical field of oil field self grouting, in particular to an oil field self-grouting device which comprises a body, a fixing cylinder and a sliding sleeve. The fixing sleeve is fixedly arranged in the body. A sealing plate with the outer diameter smaller than the outer diameter of the fixing cylinder is integrally fixed on the inner side of the lower end of the fixing cylinder. A liquid inlet is formed in the middle of the fixing cylinder. The sliding sleeve is fixed in the fixing cylinder above the liquid inlet through a shearing pin. The inner side of the upper portion of the sliding sleeve is in a frustum shape. The inner side of the fixing cylinder above the sliding sleeve is in a frustum shape. The oil field self-grouting device is reasonable in structure and convenient to use, a blocking plate is removed, the inner side of the upper portion of the fixing cylinder is arranged to be in the frustum shape, so that the problem that when a sitting-sealing ball body rises up, the sitting-sealing ball body falls on the fixing cylinder and cannot go back to the sliding sleeve is avoided, and accordingly the hidden danger that when the blocking plate is in fault, lockout maintaining can be caused, and construction efficiency is affected can be lowered, and cost is lowered.