The invention discloses an electrostatic dust collector three-dimensional model construction method based on CATIA. The method comprises the following steps of component classification, component parameter design, parameterized component creation, parameter table creation, component library establishment and three-dimensional model construction. The overall, rapid and linked parameter adjustment and layout design of the electrostatic dust collector model are carried out based on three-dimensional modeling software CATIA, wherein a universal electrostatic dust collector component library is formed through rapid parameterization design, all components in the library are directly called when the three-dimensional model of the electrostatic dust collector is constructed, and the modeling speed is high; by dynamically modifying model parameters, quickly endowing the model with attributes and increasing the information amount of the model, a more accurate, comprehensive and systematic information model is constructed, the efficiency and precision of modeling and parameter design can be effectively improved, and the design cycle and resource consumption are reduced. Thus, a user only needs to modify the parameter value of the parameterized part template so that the target part can be established; or only the key part of the part needs to be defined as a certain parameter, and the product is designed and optimized by modifying the parameter.