The invention discloses a steerable screw drill tool. The steerable screw drill tool comprises a cylinder body, a bypass valve assembly, a hydraulic motor assembly, a universal shaft assembly, a transmission shaft assembly and a rotating motor; the bypass valve assembly, the hydraulic motor assembly, the universal shaft assembly and the transmission shaft assembly are all arranged in the cylinderbody; the bypass valve assembly, the hydraulic motor assembly, the universal shaft assembly and the transmission shaft assembly are connected with each other in sequence from top to bottom; the rotating motor is connected with the upper end of a drill stem in a transmission manner; the lower end of the drill stem is fixedly connected with the upper end of the cylinder body; and an included angle is formed between the cylinder body and the extending direction of the drill stem. According to the steerable screw drill tool, the structure is novel; the steerable screw drill tool can steer in the drilling process; a difficult problem that a traditional screw drill tool can only drill holes in an oriented manner is solved; and meanwhile, the cylinder body rotates in the drilling process so thatthe diameter of the drilled hole is increased to realize a broaching effect.