The invention discloses a hydraulically-driven fracturing pump. The hydraulically-driven fracturing pump is provided with an oil inlet P, an oil return opening T, a liquid inlet V and a high-pressureliquid outlet H, and comprises a booster cylinder and a pilot-type hydraulically-operated directional valve. The booster cylinder comprises a low-pressure cylinder body, a low-pressure piston, a high-pressure plunger, a high-pressure cylinder body and an end cover. When the low-pressure piston moves leftwards to the left end limit position, the pilot-type hydraulically-operated directional valve is triggered for reversing, and when the low-pressure piston moves rightwards to the right end limit position, the pilot-type hydraulically-operated directional valve is triggered for reversing. The fracturing pump is simple in structure and free of electric control.