The invention provides comprehensive pipe gallery raft and wall interior angle haunching BIM modeling and steel bar fine adjustment thereof. The method comprises the steps that firstly, a cornice component is newly built, and a triangular haunch component is drawn; secondly, a haunched steel bar auxiliary line is arranged, a haunched steel bar auxiliary line hook is removed, and a haunched steel bar straight section auxiliary line is formed; thirdly, the haunched steel bars are arranged, the lengths of hooks at the two ends of the haunched steel bars are defined, and then the auxiliary lines of the straight sections of the haunched steel bars are deleted; fourthly, haunch angle components are drawn according to the trend of the pipe gallery, the structural elevation is adjusted according to needs, and after drawing is completed, the haunched steel bar engineering quantity is summarized and calculated. According to the method, the purpose of fine amount calculation is achieved through the functions of existing software in combination with professional atlas, drawing specifications and a flexible series combination modeling method, the actual use requirement of work is met, investment is controlled, and the purposes of creating effects and benefits are truly achieved. According to the method, the engineering amount calculation efficiency is improved, the amount difference is reduced, the problem that existing BIM amount calculation software is short is solved, and accurate data support is provided.