The invention relates to a powerful drum of a coal cutter. The powerful drum comprises a drum body (8), a combined main blade (4) and an end disc (6), wherein small blades (9) are arranged at the tail part of the combined main blade (4); the bottoms of the small blades (9) are fixedly welded with the drum body (8); a water inlet channel (402) is formed inside the combined main blade (4); a group of spray holes (401) is formed in the side face of the tail part; the spray holes (401) are communicated with the water inlet channel (402); the spraying direction moves along the axial direction of the drum body; auxiliary blades (2) are arranged on the combined main blade (4); a sealing plate (3) is arranged between the auxiliary blades (2) and the combined main blade (4); a rib plate (5) is fixedly arranged between the combined main blade (4) and the drum body (8); the end disc (6) is welded on the drum body (8); and a wear-resistant plate (7) and small end disc cutting teeth (10) are arranged on the outer side of the end disc (6) along the axial direction of the drum body. According to the powerful drum of the coal cutter disclosed by the invention, the strength and wear resistance of the coal cutter drum are enhanced, and the service life of the drum is prolonged.