Aiming at the characteristics and needs of manufacturing process of multi-variety and small-batch machining workshop，a descriptive model of multi-variety and small-batch machining workshop digital manufacturing is proposed and discussed，which includes one basic meaning，seven-dimensions target system，five operating mainlines and eight characteristics. Then a five-level general framework of multi-variety and small-batch machining workshop digital manufacturing is established based on the model. It provides a reference for the research，development，implementation and application of the digital manufacturing system for multi-variety and small-batch machining workshop. The above model and framework have been applied practically in a typical multi-variety and small-batch manufacturing enterprise and good effects have been obtained.