A processing method for a high performance titanium connecting sealing ring for deep-sea oil drilling and production device, comprising a ring body, the ring body being of a ring shape, and the inner part of the ring body is a center hole, with a ring-shaped convex plate, a platform, an inclined end surface and a flat end surface arranged in sequence in the circumferential direction of the outer circumferential surface of the ring body, and an thread is processed in the inner circumferential surface of the center hole, said method being characterized by comprising the steps of preparation of titanium sponge, vacuum melting of a titanium ingot, forging prescribing, heating forging, heat treatment and machining, specifically comprising: (a) the step of preparation of titanium sponge, comprising drying the selected and purchased sponge titanium for later use; (b) the step of vacuum melting of the titanium ingot, comprising pressing the dried sponge titanium into an electrode block, welding into a melting electrode by argon-arc welding, and carrying out vacuum melting, wherein the vacuum melting is recycled at least two times; and cooling, and sampling for chemical analysis, wherein a Φ550 mm-650 mm titanium ingot is formed if qualified; (c) the step of forging prescribing, comprising heating the titanium ingot to 950°C-1200°C and preserving heat for 250 min-380 min, carrying out three-upsetting three-pulling forging to form a long titanium billet, and then sawing and forging into a small titanium billet according to specification; (d) the step of heating forging, specifically comprising three stages: a first stage: heating the small titanium billet to 760°C-900°C, forging and preserving heat for 100 min-140 min, and forging to obtain a desired blank, and then punching to form the center hole to obtain a cavity blank, cooling, and grinding for the first time; a second stage: heating the cavity blank after the grinding for the first time to 800°C-900°C, forging and preserving heat for 100 min-140 min, then reaming, cooling and grinding for the second time; and a third stage: heating the cavity blank after the grinding for the second time to 810°C-880°C, forging and preserving heat for 100 min-140 min, and forging to form a titanium connection sealing ring blank; (e) the step of heat treatment, comprising heating the titanium connecting sealing ring blank to 650°C-700°C in the non-vacuum condition and preserving heat for 100 min-140 min, carrying out annealing treatment, cooling and sampling for physical performance test, and entering the machining step after qualified; and (f) the step of machining, comprising machining the convex plate, the platform, the inclined end surface, the flat end surface and the center hole by a machining tool, and then grinding to obtain a bright titanium connecting sealing ring, and warehousing a finished product after qualified. (a) the step of preparation of titanium sponge, comprising drying the selected and purchased sponge titanium for later use; (b) the step of vacuum melting of the titanium ingot, comprising pressing the dried sponge titanium into an electrode block, welding into a melting electrode by argon-arc welding, and carrying out vacuum melting, wherein the vacuum melting is recycled at least two times; and cooling, and sampling for chemical analysis, wherein a Φ550 mm-650 mm titanium ingot is formed if qualified; (c) the step of forging prescribing, comprising heating the titanium ingot to 950°C-1200°C and preserving heat for 250 min-380 min, carrying out three-upsetting three-pulling forging to form a long titanium billet, and then sawing and forging into a small titanium billet according to specification; (d) the step of heating forging, specifically comprising three stages: a first stage: heating the small titanium billet to 760°C-900°C, forging and preserving heat for 100 min-140 min, and forging to obtain a desired blank, and then punching to form the center hole to obtain a cavity blank, cooling, and grinding for the first time; a second stage: heating the cavity blank after the grinding for the first time to 800°C-900°C, forging and preserving heat for 100 min-140 min, then reaming, cooling and grinding for the second time; and a third stage: heating the cavity blank after the grinding for the second time to 810°C-880°C, forging and preserving heat for 100 min-140 min, and forging to form a titanium connection sealing ring blank; (e) the step of heat treatment, comprising heating the titanium connecting sealing ring blank to 650°C-700°C in the non-vacuum condition and preserving heat for 100 min-140 min, carrying out annealing treatment, cooling and sampling for physical performance test, and entering the machining step after qualified; and (f) the step of machining, comprising machining the convex plate, the platform, the inclined end surface, the flat end surface and the center hole by a machining tool, and then grinding to obtain a bright titanium connecting sealing ring, and warehousing a finished product after qualified.