Slotting machine for gas extraction of coal seam

The utility model relates to a slotting machine for gas extraction of a coal seam, in particular to a slotting machine for gas extraction. According to the slotting machine, the construction width islarger than or equal to 1 m, and the height is larger than or equal to 0.3 m. The adopted technical scheme is as follows: the device comprises a main box body, a cutter head, a power system, a guide connector and a propelling system, the main box body is a cuboid matched with the cross section of a kerf in shape, the cutter head is located in front of the main box body, connected with the main boxbody through a cutter head support and connected with the power system driving the cutter head support to rotate, and the front end of the cutter head support is connected with a guide hole drill rodthrough the guide connector; the cutting cutterhead is a flat cylindrical cutterhead, and cutting teeth are densely distributed on the circumferential surface of the cutting cutterhead; the propelling system comprises a horizo