The utility model aims to provide an integrated semi-direct-driven tide generating set comprising an impeller, a spindle, a gear shaft and a chamber. The spindle comprises a thick shaft section and a thin shaft section which are connected, a cone is arranged at the joint of the thick shaft section and the thin shaft section and is provided with an extension portion towards the direction of the thin shaft section, a groove is formed between the extension portion and the thin shaft portion, the gear shaft sleeves the thin shaft section through a hollow structure thereof, one end of the gear shaft is located in the groove, the extension portion of the cone is provided with protrusions along the own periphery, planet gears are mounted on all the protrusions, each protrusion is matched with the corresponding planet gear through a bearing, teeth are arranged on the outer wall of the gear shaft, a gear ring and a stator are fixed on the inner wall of the chamber, the planet gears are meshed with the gear ring and the teeth of the gear shaft at the same time, a rotor is connected to the outside of the gear shaft fixedly, and the rotor is located inside the stator. A speed change gear box and a generator case are integrated, and accordingly the chamber of the unit is simplified fundamentally.