The invention discloses a ballastless track BIM design and quantity calculation method based on a dassault V6 system. The method is characterized by comprising the following steps that the step 101, a ballastless track quantity calculation attribute set defined in the IFC standard is expanded; the step 102, a three-dimensional skeleton of a ballastless track model is created in the dassault V6 system; the step 103, according to the IFC standard, ballastless track engineering templates and related components are developed in the dassault V6 system; the step 104, a ballastless track three-dimensional model is generated through instantiation, and the quantity calculation attribute value of the ballastless track is automatically added in the generation process; the step 105, a data file based on the ballastless track model is derived from a project management platform of the dassault V6 system; the step 106, an engineering quantity report template with calculation rules is prepared; the step 107, the data file and the engineering quantity report template are analyzed to obtain the ballastless track engineering quantity. The method aims to achieve the calculation of the ballastless track engineering quantity on the basis of the ballastless track BIM model.