Biogas purification and separation membrane system makes it possible by increasing calorific value of ordinary biogas.The quality level of pure biogas is similar to vehicle fuel.In this paper,decarburization separation membrane module is the key components of biogas separation and purification membrane system.The module consist of membrane shell and hollow fiber membrane core.The membrane shell structure design parameters are based on both the design parameters of hollow fiber membrane core and the design method of pressure vessel according to steel pressure vessels standard.The shell 3-D model was constructed on the basis of the design parameters of the shell using Simulation in Solidworks.