The invention discloses a computer-aided design (CAD) graph and image mixed editing system, which comprises an expression and storage module, a primitive acquisition module, a first selection module, a second selection module, a first image editing module, a second image editing module, a primitive fusion module and a uniform primitive editing module, wherein the expression and storage module is used for uniformly expressing graphs and images through a uniform bottom abstract type and storing the graphs and the images in a storage medium; the primitive acquisition module is used for inputting graph elements by a user, acquiring the graph elements and image elements and displaying the graph elements and the image elements in a view in a mixed mode; the primitive acquisition module comprises a graph opening sub-module, an image inserting sub-module and a clipboard operating sub-module; and the graph opening sub-module is used for opening graph and image mixed format files completed in previous work of the user. Through the system, the graphs and the images can be fused together by a designer and used as a uniform model for editing.