Abstract: Metal sheath is an important part of XLPE high-voltage cable,the characteristics of existing process and equipment for cable aluminum sheath were introduced. SSLB500 continuous extrusion machine was developed which is in the vertical model and with double shafts. The size and performance of extruded aluminum sheath were tested,the production data was analyzed. The results show that the structure of the die is reasonable which is designed based on the optimization results of numerical simulation,the roundness of extruded aluminum sheath reaches 99%,the thickness deviation is within ±5%. The bonding strength in the welding area is 78. 8 MPa and the elongation is33. 3%,the same performance as the welded free zone. The machine can run steadily and reliably for a long time,the average output is 738 kg/h when the main shafts run between 6 ～ 7. 5 r/min,the average energy consumption is440 k Wh/t,the flash rate is less than 7%. All the data show that the process and equipment have the advantages of good product quality,high production efficiency and low running cost,which can meet the requirements of quality and efficiency improvement in cable manufacturing enterprises.