The invention discloses a horizontal socket-type connector for deepwater manifolds. The horizontal socket-type connector comprises a connector assembly and a hub seat assembly. The connector assembly comprises a connecting cover and a female hub seat disposed on the connecting cover. One end of the female hub seat is sleeved on a bearing ring, and a lifting ring is disposed on the bearing ring. The part of the bearing ring, corresponding to the lifting ring, is provided with a positioning cone. The hub seat assembly comprises a bottom frame, a hub base and a positioning conical tube, wherein the hub base and the positioning conical tube are disposed on the bottom frame. A hub fixing block is disposed on the hub base, and a male hub seat is connected to the hub fixing block. The female hub seat and the male hub seat can be in hermetic fit. The positioning cone can be fitted with the positioning conical tube. According to the positioning scheme design of the connector accurate in positioning, the design of the two-stage guide positioning cone provides convenience for positioning, axial regulating bolts are designed to adjust axial deviation of the positioning structure, and the lifting ring is designed to guarantee axial position of the connector.