Directional hydraulic topping method and device

The invention belongs to the technical field of coal mining, and discloses a directional hydraulic roof cutting method which comprises the following specific operation steps: S1, detecting the production geological conditions of a working face, and analyzing and judging the position of a key rock stratum of a roof; s2, designing parameters such as hydraulic top cutting direction and range according to results of working face production geological condition detection; s3, roof cutting drilling is constructed according to the roof cutting parameters; and then directional hydraulic top cutting work is carried out according to the designed parameters. A whole set of complete directional hydraulic top cutting device is arranged, the directional hydraulic top cutting device comprises a slotting and fracturing integrated device, a high-pressure double-layer drill rod, a high-pressure mortar water jet device and the like, a directional hydraulic top cutting method is adopted, seam grooves are prefabricated in the inn