The invention discloses an overflow device of an advance strengthening and grout sealing device and an advance strengthening and grout sealing device with the overflow device. The overflow device comprises a grout stopping mechanism, wherein the grout stopping mechanism comprises a grout stopping plate, an arm plate, a grout stopping shaft and a swing mechanism, wherein the grout stopping plate can be matched with a grout stopping port at the front end of an internal cylinder; the grout stopping shaft is positioned outside the wall of the internal cylinder and rotatablely fixed on an externalcylinder, and the axis of the grout stopping shaft is perpendicular to the midline of the internal cylinder; the arm plate is connected with the grout stopping shaft and the grout stopping plate and positioned between the internal cylinder and the external cylinder; the matching surface of the grout stopping plate and the grout stopping port is a rotatable curved surface; and when the grout stopping plate rotates along with the grout stopping shaft, the grout stopping port can be opened. The overflow device can reduce the overturn angle of the grout stopping plate, reduce the possibility of blockage of the grout stopping port and provide convenience for washing the grout stopping device. The overflow device and the advance strengthening and grout sealing device are suitable for the advancestrengthening operations on the operation surfaces in the project.