Cab noise reduction device for engineering machinery

The cab noise reduction device for the engineering machinery comprises a cab box and a top cover, the top cover is arranged at the top end of the cab box, positioning seats are symmetrically installed at the bottom end of the cab box, a sound insulation cotton layer is installed on the inner wall of the cab box, and the sound insulation cotton layer is fixedly connected with the cab box. A damping cotton layer is mounted at the bottom end of the top cover above the cab box, the damping cotton layer is fixedly connected with the top cover, connecting seats are arranged outside the cab box below the positioning seats, and supporting seats are arranged outside the cab box on one sides of the connecting seats. According to the cab noise reduction device for the engineering machinery, multi-position elastic damping supporting and convenient control opening ventilation of the cab noise reduction device for the engineering machinery are achieved, noise generated when a cab is used is reduced, the comfort degree of t