The invention relates to a mold preventing a hot vulcanized rubber product parting line against shrinkage crack. The mold is composed of an upper mold plate, a middle mold plate and a lower mold plate, wherein the upper mold plate is provided with an upper mold plate boss, the lower mold plate is provided with a lower mold plate boss, and the upper mold plate boss and the lower mold plate boss arematched with the two ends of a middle mold plate correspondingly and are provided with gaps in a reserved manner. The mold preventing the hot vulcanized rubber product parting line against shrinkagecrack has the beneficial effects that existing technical problems are overcome, and the improved mold preventing the hot vulcanized rubber product parting line against shrinkage crack is innovativelyput forward; and according to the mold structure, the closed performance in a mold cavity in the vulcanizing machining process is kept, the gaps for cooperation between the middle mold plate and the upper mold plate as well as between the middle mold plate and the lower mold plate make redundant rubber overflow to relieve pressure, and therefore the shrinkage crack phenomenon happening to the surface of a rubber shock absorbing cushion block in the vulcanizing machining process is reduced.