The utility model discloses a tunnel borehole depth controller, a tunnel borehole depth controller, including can be to closing the cardboard that clamps on the drilling rod, the baffle be installed respectively to the bottom of cardboard, hinge connection is passed through to one side of two cardboards, and the cardboard inside callipers is equipped with the piece rather than complex non -slip rubber, and the rubber circle internal diameter that the non -slip rubber piece encloses is less than the diameter of drilling rod, and the locking fastener of mutual correspondence is installed respectively to the opposite side of cardboard. The utility model discloses a hinge structure that can launch or draw in makes things convenient for the dismouting of porthole controller, has improved convenience and flexibility in the construction, and the adoption can make the locking fastener of porthole controller fastening drilling rod and the non -slip rubber piece that can strengthen frictional force, prevents that the porthole controller from sliding on the drilling rod, plays accurate control borehole depth's effect, and the adoption can stop the baffle bigger slightly than the porthole thatthe drilling rod crept into, prevents that the steel ring from being brought into the porthole by the drilling rod, play accurate control borehole depth's effect.