The invention discloses a building method for abrasive bricks at the end part of an unloading chute of a rotary hearth furnace. According to the method, casting strips are reserved on the two sides ofa steel structured shell at the end part of the unloading chute; an abrasive brick building position is positioned between the reserved casting strips; wear resisting steel plates are welded on the two sides of the shell; tie pieces are welded on the inner sides of the wear resisting steel plates, and are connected with a steel plate at the bottom of the shell; anchoring nails are welded to gapsof the tie pieces in a crossed manner; in the abrasive brick building position, wear resisting stoppers are welded between adjacent abrasive bricks along the axis of the shell and welded at the positions, at the abrasive brick end faces, of the steel plate at the bottom of the shell, and the abrasive bricks are built; abrasive castable is cast in the reserved casting strips for compaction; and during casting, combined parts of the abrasive bricks and the reserved casting strips form slopes for supporting the abrasive bricks slightly projected. According to the method, the end part of the unloading chute is built as an organic whole, so that both wear and scouring are resisted, excellent heat stability is achieved, meanwhile, the overall stability of the structure is improved, the service life is prolonged, and the production operation of the rotary hearth furnace is guaranteed.