Pipeline trepanning positioning device

The utility model provides a pipeline trepanning positioning device, and belongs to the technical field of fire fighting pipeline construction. Comprising a reference piece, a distance piece and a laser range finder, the reference piece and the distance piece are both in a semicircular plate shape, and the inner diameter of the reference piece and the inner diameter of the distance piece are consistent with the outer diameter of a to-be-punched pipeline. A baffle perpendicular to the central axis is arranged on the reference part, and an indication line is arranged on the baffle and located in the radial direction of the reference part; the laser range finder is clamped right above the middle part of the distance fixing piece and is used for measuring the distance from the baffle plate; and the laser path of the laser range finder is parallel to the central axis of the distance fixing piece. According to the utility model, the distance measuring precision can be ensured, and the punching position can be quick