The invention relates to a multi-cavity vulcanizing mould. Flow passages for viscous rubber to flow are formed in the multi-cavity vulcanizing mould; the flow passages include a first-layer flow passage, a second-layer flow passage and a third-layer flow passage which are communicated with one another, the first-layer flow passage is communicated with an injection opening of the multi-cavity vulcanizing mould; a plurality of temperature adjusting flow passages capable of promoting thorough mixing of the interior and the exterior of the viscous rubber so as to reduce the temperature difference between the interior and the exterior of the viscous rubber are formed in the second-layer flow passage; the third-layer flow passage is communicated with a vulcanizing cavity for vulcanizing a product required to be vulcanized. Through a design, rubber in the inner core and rubber on the outer wall are thoroughly mixed, so that the temperature difference between the rubber in the inner core and the rubber on the outer wall is reduced from the original 10 DEG C to 0.5 DEG C, the product vulcanizing time is shortened, and the production efficiency is improved.