A middle-duty and heavy-duty automobile knuckle stamp forging extruding compound technology overcomes the disadvantages of low material utilization and large device investment of the traditional production technology, utilizes flexibility of preforming by a stamping hammer and structure characteristic of a press extrusion die and adopts stamping hammer production technology and press extrusion compound technology. The main technical scheme includes a series of technical measures of vertically splitting of blank material by mould with V-shaped cutting edge and locally enclosed structure, preforging of cavity damping stripe, finish forging of locally enclosed structure, hot extrusion forming of steering space and the like, parameter requirements and corresponding moulds and devices. The invention has the characteristics that device investment of stamping hammer production technology is small, structure is simple, and equipment manufacturing period is short; production technological flowis reasonable and processing is easy; and the invention also has the characteristics that product quality is good and productivity is high; and material utilization is obviously higher than that of any original knuckle processing technology and production cost is greatly reduced.