The invention relates to a novel combined bulletproof helmet. The novel combined bulletproof helmet comprises an outer-layer helmet, a middle-layer helmet and an inner-layer helmet, wherein the shape of the outer layer helmet, the shape of the middle layer helmet and the shape of the inner layer helmet are the same, and the size of the helmet is gradually and slightly enlarged from outside to inside, so that the situation that the outer-layer helmet, the middle-layer helmet and the inner-layer helmet can be tightly sleeved and buckled from outside to inside is guaranteed. The novel combined bulletproof helmet disclosed by the invention is light in weight, favorable in protection effect, and suitable for being carried, and the defects that a bulletproof helmet in the prior art is too heavy in weight and single in functions can be overcome; the novel combined bulletproof helmet has many expanded functions, under the premise that a conventional simple protection function is not changed and the function is slightly improved, the use flexibility and the use safety are improved; and through a layering combined airtight principle, in actual fight of an individual soldier in the field, the novel combined bulletproof helmet can have a certain reaction armouring effect, and the kinetic energy of an assaulting bullet or an assaulting fragment breaking up the outer layer helmet or the middle layer helmet is reduced.