The invention discloses a digital twin technology equipment product carbon footprint digital accounting method and system, and belongs to the technical field of enterprise product carbon emission, and the method comprises the steps: S1, building a model field information code; s2, establishing a configurable carbon footprint accounting model; s3, establishing a configurable carbon accounting strategy; s4, establishing a mapping relation between a carbon accounting strategy and basic data; s5, establishing a unified product category library, formulating a standard coding rule and mapping BIM model data; s6, making a standard coding rule by the unified material coding library and mapping BIM model data; s7, based on a twin model and an interface technology, realizing data acquisition in multiple data acquisition modes; s8, equipment product automatic accounting based on a twin model or real-time data; s9, comparing the carbon emissions based on different carbon accounting schemes; s10, real-time monitoring of enterprise product carbon emission is carried out; and S11, analyzing and evaluating the carbon emission in the whole life cycle of the product.