The invention discloses a rotational molding mould and a processing technology thereof. A material-structure-process coupling design system can be developed, an all-plastic vehicle body mould is divided into three-dimensional units through preparation of glass fiber reinforced polyethylene resin and auxiliary materials and by a large complicated aluminum alloy mould unit segmenting, combining andmolding method, aluminum alloy micro-elements are manufactured by an aluminum alloy casting molding technology, the shape-responsible all-plastic vehicle body mould can be divided into different parts, thus, the integral processing difficulty of the vehicle body mould is reduced, the service life of the mould is prolonged, the apparent quality of the product is ensured, a novel temperature controlmethod for directional heating is introduced in the process, under the micro-control of ensuring the global temperature uniformity of the mould, directional heating of some key areas can be realized,high-quality products with uniform wall thicknesses can be produced, local areas can even be thickened, the mechanical strength of the product is improved, and the service life of the product is prolonged.