The invention discloses a layered pre-splitting blasting method for reducing coal mine thick and hard stratum breaking disaster-causing risks. The method can reduce coal mine thick and hard roof breaking disaster-causing risks. The method includes the following steps that a stone drift is excavated in a thick and hard stratum covering a coal seam, a plurality of parallel drilled holes are drilled through a drilling device by means of stone drift work space, then the parallel drilled holes are filled with explosives, detonators and other blasting devices, then drilled hole blocking and blasting network connection are conducted, and finally, the explosives are detonated in a simultaneous blasting detonation mode so that pre-cracks can be generated between blast holes. Layered pre-splitting blasting of the thick and hard stratum is achieved by means of the horizontal parallel drilled holes in the simultaneous blasting mode, the technology is simple, operability is high, thick and hard roof harm can be eliminated, and safe production of a coal mine is achieved.