The device collecting eggshells and eggshell membranes is used to collect separated eggshells and eggshell membranes from their mixture. At present, the device collecting eggshells and eggshell membranes has been studied and designed in the laboratory. A perfect collecting effect was achieved, and eggshells and eggshell membranes were collected separately after separation. Aiming to have the research results universally and save the design time while being applied in factory, based on the similarity theory and the researched device collecting eggshells and eggshell membranes in the laboratory as the model, a similarity design method of the device collecting eggshells and eggshell membranes was proposed. The collecting fluent processes were simulated respectively in the device designed by the similarity design method when the solid load was 6kg/s, 12kg/s, 18kg/s and 24kg/s. And furthermore, a device of which scalar was 1.2 compared with the model of the device collecting eggshells and eggshell membranes was designed. Both simulations and experiment verified correctness and feasibility of the design method of the device collecting eggshells and eggshell membranes. A software was programmed by application development of CATIA and AutoCAD based on Visual Basic 6.0, which gave direct access to 3D models, 2D drawings and working parameters of the device collecting eggshells and eggshell membranes. The efficiency of design was improved, and the cost was reduced. And then the rapid design of the device collecting eggshells and eggshell membranes was realized.