A new forming process based on metal flow control was proposed for the structural characteristics of thin-walled special-shaped single ear sling product. The metal flow law in closed extrusion process was analyzed, in which the temperature field was the key factor affecting the final filling effect, and the difference of extrusion speed could cause the difference of deformation temperature field that the faster the extrusion speed was, the less the heat loss of billet was, and the more conducive to the forming of product. The research finds that the maximum height difference of the end surface reaches 16.6 mm during the forming process of single ear sling. Then, in order to improve the consistency and stability of product size, an analysis model for the metal flow control was established, and the height difference of the product after forming under the action of five back pressures was studied. It is found that under the back pressure of more than 500 kN, the height difference reduces to less than 3 mm. Finally, based on the analysis, a special process mold and equipment were designed, in which the back pressure loading was realized by an oil cylinder with adjustable pressure of 500-2000 kN, and the qualified single ear sling extrusion parts were obtained by experiments, realizing the forming process development of such products.