The invention discloses a method of fixing a water check strip of a tunnel stunt wall. The method mainly comprises the steps that a fixing device of the water check strip is made; a straightening device of the water check strip is made; the fixing device is mounted on the water check strip; the straightening device is mounted on the water check strip; the water check strip is pulled straight through a wire grip. By the cooperative use of the fixing device and the straightening device, when fixing is conducted on the water check strip, the operation method is simple, the time required for straightening and fixing the water check strip is shorter, the straightness and aesthetics of the water check strip of the tunnel stunt wall can be greatly improved, the construction quality is ensured; the required steel ribs for fixing the water check strips can be significantly reduced, material cost is saved; the time of mounting the water check strips and fixing the steel ribs can be greatly shortened, labor cost is saved. The adopted fixing device and straightening device are simple in structure, can be directly welded together on site, and are low in cost and high in operability.