The utility model discloses an on-arch pier integral type anti-beam-falling structure, which aims to effectively improve the anti-seismic and anti-beam-falling performance of a bridge, not only meet the requirement of beam falling prevention, but also meet the requirement of railway bridge engineering on support overhaul and passage, and well solve the problem of mutual interference between anti-beam-falling measures and support inspection operation. Wherein the on-arch piers are arranged on the main arch at intervals along the bridge, an on-arch beam is supported on the pier tops of the on-arch piers through a support, and a left side anti-falling beam structure and a right side anti-falling beam structure which are integrally poured with the on-arch piers through reinforced concrete andare solidified to form an integral structure are arranged on the pier tops of the on-arch piers at intervals in the transverse bridge direction. The left side anti-falling beam structure and the rightside anti-falling beam structure are in reverse and forward inverted L shapes and are provided with cantilever sections and vertical arm sections, the lower ends of the vertical arm sections are fixedly connected with an arch pier, the front end faces of the cantilever sections are opposite to the outer wall of an arch beam web, and gaps exist between the cantilever sections and the outer wall ofthe arch beam web. Groove structures are arranged on the corresponding inner walls of the vertical arm sections of the left side anti-falling beam structure and the right side anti-falling beam structure, and an inspection channel is formed between the inner walls of the groove structures and the side wall of the side support.