The invention discloses a reinforcing steel bar sample turning method based on a BIM technology. The method comprises the following steps: receiving and checking design drawing; establishing a BIM three-dimensional model according to the design drawing; optimizing steel bar arrangement in the BIM three-dimensional model; carrying out technical disclosure by using a BIM three-dimensional model; exporting reinforcing steel bar parameters by using the BIM three-dimensional model; processing steel bars according to steel bar parameters. According to the reinforcing steel bar sample turning method,the reinforcing steel bar sample turning efficiency and accuracy are improved. Complex reinforcing steel bar sample turning is realized. Through a BIM three-dimensional model technology, the steel using condition of the whole project is planned as a whole to save steel. By implementing the method, the working efficiency can be improved, steel materials can be saved, and good social benefits and economic benefits are achieved.