Abstract: Lightweight technology is the current car one of the most effective way of energy saving and emission reduction. All-plastic body molding method is the key technology to the breakthrough lightweight of automobile. Rotational molding process can be applied to achieve the overall automobile plasticizing manufacturing. This paper mainly describes the overall lightweight design, molding equipment, body mold, processing technology and other advanced manufacturing technology of all-plastic body, and carries on the research contrast test. The results show that the application of computer-aided design, mechatronics and polymer materials in advanced technology, through the rotational molding equipment by heat analysis and optimization of energy efficiency, the use of wireless temperature measurement technology in the mold, the blocking unit quick clamping technology and micro-foam technology can meet the all-plastic body forming a whole.