For the dieless spinning accuracy problem of non-symmetrical and non-circular cross-section which is the focus and difficulty in the research of dieless spinning, taking the thin-walled hexagonal frustum part as the research object, dieless spinning method was used to form,and based on the geometric relationship of formed parts,the radial and axial operation laws of spinning wheel with the shape of hexagonal frustum, and the trajectory formula of spinning wheel path was derived. Then, the forming process was simulated by software ABAQUS, and the distribution laws of equivalent stress, equivalent strain and wall thickness were analyzed. Furthermore, on this basis, the non-circular cross-section spinning experiment was carried out to obtain the thin-walled hexagonal frustum parts consistent with the model by PS-CNCSXY600-5 CNC spinning machine, which verifies the reliability of the numerical simulation results for the hexagonal frustum dieless spinning and the feasibility of the process, and provides support for the subsequent research on the dieless spinning method and forming mechanism of special-shaped parts,which has high application value.