The invention provides a cabin sound insulation and noise reduction structure. The cabin sound insulation and noise reduction structure includes an anti-icing panel (1) and sound absorption materials(2), the anti-icing panel (1) is a zigzag-shaped flatness piece, and the sound absorption materials are pasted on one side of a concave surface of the anti-icing panel (1); and an outer side structureformed by the anti-icing panel (1) and the sound absorption materials (2) is arranged on fuselage skins (4) which are arranged at the outer side of an anti-icing boundary region of a turboprop planein a butt-joint mode, the outer structure, the fuselage skins (4) and stringers which are arranged at another side of the fuselage skins (4) are connected in a penetrating mode by rotatably tighteningbolts which are arranged at the two ends of the outer structure, and a spoiling flap (6) is pasted at a region between the two stringers (5) which are arranged at another side of the fuselage skins (4). According to the cabin sound insulation and noise reduction structure, the problem that a fuselage cabin close to a propeller leaf apex is high in noise is solved, fatigue influence to fuselage wall plates due to the vibration generated by the impeller and the impact load acted on the impeller leaf apex during throwing ice off are weakened.