The invention discloses a far field key stratum roof cutting and pressure releasing roadway protection method based on a triangular plate structure model and belongs to the field of coal mining. The method comprises the steps that the stratum position of a far field key stratum influencing working face free roadway mine pressure behavior is determined; the arranged position coordinate of ground drilling is determined, and drilling construction is conducted; and a complete cutting fracture plane parallel to a coal pillar is formed on the far field key stratum through the ground drilling fracturing technology. Presplitting of the far field key stratum above a free roadway in advance is facilitated, and the cutting plane parallel to the coal pillar is formed on the far field key stratum, so that stress transferring is obstructed, mine pressure is released, the length of a lateral rotation block body of a fractured side original roof rock stratum of the free roadway is reduced, the strong mine pressure behavior of the free roadway can be relieved essentially, the supporting requirement of a roof is reduced, accordingly the reserved width of the coal pillar is reduced greatly, the coal recovery rate is increased effectively, and economic benefits are increased.