Steel pipe wall trepanning intersecting line marking device

The utility model relates to the technical field of steel pipes, in particular to a steel pipe wall trepanning intersecting line marking device which comprises a platform, a first sliding rod, a second sliding rod, a positioning shaft and a third sliding rod. The platform is in sliding connection with the first sliding rod and is provided with a connecting point, and the first sliding rod can rotate around the connecting point in the same vertical plane with the platform; the second sliding rod is perpendicular to and slidably connected with the first sliding rod, the positioning shaft is perpendicular to and slidably connected with the second sliding rod, and the first sliding rod, the second sliding rod and the positioning shaft are located in the same plane and arranged in a C shape. The third sliding rod is rotationally connected with the positioning shaft and is perpendicular to the positioning shaft, the third sliding rod is provided with a light source capable of emitting visible light beams, the probl