The present invention discloses a method for rendering and displaying complex industrial cropped curved surfaces. The method comprises the steps: 1, performing cropped curved surface and curve discretization; 2, performing complex rectangular block determination and subdivision; 3, sorting the vertices in the cropped region; 4, using an improved recursive node connection method to form a triangleunit and rendering and displaying the triangle unit; and the like. According to the method disclosed by the present invention, the complex and non-complex condition in the industrial cropped curved surface are fully considered, and the concave polygon can be effectively processed, so that functions of segmenting the cropped region to form a triangular unit, and rendering and displaying the triangular unit can be achieved, and the processing ability and efficiency of the large and complex industrial cropped curved surface model can be further improved.