The invention discloses a muddy water stirring device suitable for a tunneling machine. The muddy water stirring device comprises a muddy water tank (1), a stirring system (2), a drive system (3), a water inlet pipe (4) and a sealing cover (5). The stirring system (2) is located in the muddy water tank (1), the drive system (3) is located on the rear portion of the muddy water tank (1) and connected with the stirring system (2), and the water inlet pipe (4) is arranged above the inner side of the muddy water tank (1); and the sealing cover (5) is arranged on the muddy water tank (1) in a covering mode and located above the water inlet pipe (4), the muddy water tank (1) comprises a tank body, a residue unloading hole, residue feeding fence, a mud discharging fence and a mud discharging opening, and the residue unloading hole is located in the lower portion of a side plate of the residue feeding side of the tank body. According to the muddy water stirring device suitable for a tunneling machine, residue soil discharged by the earth pressure tunnel balance tunneling machine can be collected into the muddy water tank through a residue collecting opening and is mixed with water injected into a water inlet pipe, compared with a traditional residue discharging mode, the method can effectively improve residue discharging efficiency, and the construction period is shortened.