A fixing device for glass of an engineering mechanical cab is characterized in that a front supporting plate, a lower supporting plate, a rear supporting plate and a mounting plate are fixed corresponding to a glass mounting position of the cab. A front V-shaped elastic strip is mounted on the front supporting plate, a lower V-shaped elastic strip is mounted on the lower supporting plate, and a rear V-shaped elastic strip is mounted on the rear supporting plate. Protrusions for clamping the glass are arranged in middles of sections of the front V-shaped elastic strip and the rear V-shaped elastic strip, an elastic cushion is fixed onto the mounting plate and provided with an opening, and the section of the opening of the elastic cushion is matched with the section of a handle mounted on the glass. The fixing device for the glass of the engineering mechanical cab is convenient in operation, simple in structure and reliable in mounting.