The invention relates to a multi-mold-cavity mold structure. The multi-mold-cavity mold structure comprises a plurality of mold cavities and a plurality of flow passages, which are arranged on the mold, wherein the mold cavities include a first mold cavity, a second mold cavity, a third mold cavity and a fourth mold cavity, and the first mold cavity, the second mold cavity, the third mold cavity and the fourth mold cavity are distributed in an H shape; the first mold cavity and the third mold cavity are arranged on the left side, and the second mold cavity and the fourth mold cavity are arranged on the right side; the flow passages include a first flow passage, a second flow passage, a third flow passage and a fourth flow passage, the first flow passage is transversely arranged, the first mold cavity and the second mold cavity are arranged on one side of the first flow passage, the third mold cavity and the fourth mold cavity are arranged on the other side of the first flow passage, one end of the second flow passage is communicated with the first mold cavity, the other end of the second flow passage is communicated with third mold cavity, one end of the third flow passage is communicated with the second mold cavity, the other end of the third flow passage is communicated with the fourth mold cavity, and the first flow passage is respectively communicated with the second flow passage and the third flow passage; one end of the fourth flow passage is communicated with the first flow passage. The multi-mold-cavity mold structure has characteristics of flexibility in operation and low production cost.