The invention discloses a method for facture of a coal bed methane reservoir of high-level coal, which is applied to the technical field of development of coal bed methane of the high-level coal, and is characterized in that a facture crack cluster is upwards controlled and transversely crossly extended through centralized perforation of a big pore at the middle of a coal bed, whole sand feeding, synchronous facture of multiple wells, and construction at variable displacement and large liquid amount, so that the efficiency for facture modification of a straight well is improved, the modification range is expanded, a larger pressure drop area is formed in the coal bed, and gas output per well of the coal bed gas well is improved. The method has the effects that: the facture crack cluster is upwards controlled and transversely crossly extended through centralized perforation of the big pore at the middle of the coal bed, whole sand feeding, synchronous facture of multiple wells, and construction at variable displacement and large liquid amount, so that the efficiency for facture modification of the straight well is improved, the modification range is expanded, the larger pressure drop area is formed in the coal bed, and gas output per well of the coal bed gas well is improved.