The utility model relates to a mould for light VARTM technology, including last mould and lower mould, wherein the lower mould is equipped with and is suitable for the constant head tank of reinforceing fiber base material installation location, the surface of constant head tank covers to join there is water -soluble mandrel material layer, reinforce fiber base material with go up from bottom to top to be equipped with in proper order between the mould and lead flow net layer, glue injection pipe way and pump -line to and magnetic plastic layer, the magnetic plastic layer with the corresponding position of lateral part of reinforceing fiber base material covers to be connected, and follows the upper surface level of lower mould is outwards extended to closely magnetism inhale laminate in the upper surface of lower mould forms the confined die cavity. This technical scheme stereotypes conveniently, the drawing of patterns of being more convenient for.