The invention relates to a pre-burying arrangement mode and method of downpipes simultaneously used as demolishing blast holes in building peripheral columns. The downpipes of a plane roof building ora pitched roof building are pre-buried in the peripheral columns, the middle sections of the downpipes are parallel to long axis of the building peripheral columns, the lower ends of the downpipes extend out of the column tops or the column outer side surfaces through pipes connected to bent heads, the upper ends of the downpipes are connected with floor drains arranged at the gutter bottoms or the eaves gutter bottoms through hoppers, and the lower ends of the downpipes adopt the 135-degree bent heads to be connected with pipelines extending out of the column outer side surfaces. During construction, steel reinforcement cages of building peripheral columns of a first floor are arranged in an erecting mode, a first section of downpipes are erected in the steel reinforcement cages, the lower ends of the downpipes are exposed, formworks are supported, and concrete is poured; and the above construction is repeated until steel reinforcement cages of building peripheral columns of a top floor are arranged in an erecting mode, the downpipes are erected, and the top ends of the downpipes are connected with floor drains arranged at the roof. According to the pre-burying arrangement mode and method of the downpipes simultaneously used as the demolishing blast holes in the building peripheral columns, the appearance of the building is improved, the use time of the downpipes is prolonged, and later service and maintenance are spared; and the downpipes can be used as the demolishing blast holes of the building peripheral columns.