Double-layer overhanging anti-falling net device for building construction and mounting method

The invention discloses a double-layer overhanging anti-falling net device for building construction and a mounting method.The device comprises vertical rods, inclined rods, an anti-falling net, steel wire ropes and hanging rings, the vertical rods are fixed between a first floor bearing plate and a second floor bearing plate, horizontal steel pipes are fixed between the outer ends of every two adjacent inclined rods, the inner ends of the inclined rods are fixed to the vertical rods, and the hanging rings are fixed to the outer ends of the inclined rods; the anti-falling net is fixed between the horizontal steel pipe and the inclined rod, the hanging ring is fixed on the third floor support plate, and the steel wire rope is fixed between the hanging ring and the horizontal steel pipe. The method comprises the steps that S1, the whole supporting and positioning device is installed; s2, mounting an anti-falling net; s3, mounting a steel wire rope; and S4, the anti-falling net is pulled by adopting a net pullin