Building facade chamfering plastering auxiliary tool

The invention belongs to building construction auxiliary equipment, and discloses a building facade detail part plastering auxiliary tool. The building facade detail part plastering auxiliary tool comprises a blocking mechanism and a chamfering mold, wherein the blocking mechanism and the chamfering mold are mutually connected. When an included angle between the chamfering die and the blocking mechanism is 90-180 degrees, an upper surface mold is formed, the blocking mechanism is pressed against an adjacent surface on one side of an outer corner of the wall surface, and at meanwhile, the chamfering mold is placed on a working surface and is filled with cement mortar, and the cement mortar is leveled and removed so as to form a drainage slope. When the included angle between the chamferingmold and the blocking mechanism is 0-90 degrees, a lower surface mold is formed, the blocking mechanism is pressed against the adjacent surface on one side of the outer corner of the wall surface, andmeanwhile, the chamfering