A flexible high-intensity connection device is characterized in that an arranged tubular body is made of high-intensity filament fiber cloth, and a flexible steel wire helically arranged is sewed in an interlayer of the fiber cloth in the tubular body; the tubular body is in the shape of a truncated cone with a small upper port and a big bottom port, and the upper port serves as a coal slay inlet, and the lower port serves as a coal slay outlet. The connection device is portable and flexile, can be reused, ensures that the powder coal in the spraying orifice process smoothly flows in sequence along a set channel, ensures that the coal and the methane gas during the orifice spraying process is artificially controlled, ensures the security of personnel and coal pits and realizes continuous and fast well drilling.