Drilling angle measuring system used in coal mine

The utility model provides a drilling angle measuring system used in a coal mine. The drilling angle measuring system used in the coal mine comprises a laser datum line launcher which is used to produce a first laser plane and a second laser plane, wherein the first laser plane is perpendicular to the second laser plane. The first laser plane coincides with a tapped line of a tunnel inner wall and a midline of a tunnel, the second laser plane is intersected with a drilling rod to be measured. A digital angle measuring device measures an angle formed by the second laser plane with the drilling rod, the digital angle measuring device is arranged on the drilling rod, a place which is intersected with the second laser plane. The drilling angle measuring system used in the coal mine improves the accuracy of the drilling angle measurement parameter, guarantees the construction quality of the drilling run by gas in the coal mine and improves the gas running effect.