A composite end enclosure belongs to the technical field of central air conditioners. An end enclosure body is arranged on a vessel flange of the end enclosure, valve seats and rubber gaskets are arranged on the end enclosure body, a water inlet connector and a water outlet connector are arranged on the end enclosure body, and thereby the integrated composite end enclosure is formed. A processing process for the composite end enclosure includes the following steps: mold preparation, reinforcing material laying, vacuumization and closing of an upper mould and a lower mould, vacuumization, glue preparation, resin impregnation, curing, demoulding, trimming, post-trimming processing, inspection and warehousing. The invention has the advantages that: firstly, since the water inlet connector, the water outlet connector, the end enclosure and the vessel flange are formed in one step, the production efficiency is increased, metal material is saved, and the production cost is reduced; secondly, after connector flanges are removed from the product and locknuts and the gaskets are added on the product, the production cost is reduced, and the corrosion resistance, the tightness and the part replacement convenience are enhanced; thirdly, the processing process is simplified, the production period is shortened, and the working efficiency is increased.