The invention provides a riser later-period machining and production technological process. The riser later-period machining and production technological process comprises the following steps that one, the input working procedure is conducted, specifically, risers after casting completion are arranged on an input assembly in a linear mode and are transferred to a side-push station on by one; two, the transferring working procedure is conducted, specifically, the risers on the side-push station are pushed to a positioning station through a side-push air cylinder, primary positioning and first-stage transferring of the risers are completed, then the risers are pushed to a machining station through a positioning assembly, and second-stage transferring of the risers are completed; three, the machining treatment working procedure is conducted, specifically, the risers at the machining station are positioned and clamped through the positioning assembly, and then grinding treatment and drilling treatment of the risers are completed; and four, the output working procedure is conducted, specifically, the positioning assembly is restored and synchronously brings the machined risers in the step three back to the positioning station, and when the next to-be-machined riser is pushed to the positioning assembly through the side-push air cylinder, the machined risers are synchronously pushed to an output station and are output by an output assembly one by one.