High speed mixer is mainly used in mixing, coloring or drying before processing of polyvinyl resin, polyethylene, polypropylene, ABS, polycarbonate and other hydroscopicity resin. The materials enter the cold mixing through hot mixing and mixing at high speed, then cooling stirring to make the materials cold to avoid the hot-mixed materials degrading and agglomerating to make the addition in the hot mixed materials go on permeating and exhaust the remained gas in the hot mixed materials and store the hot mixed materials. The equipment has advantages of mixing result good, cooling fast and so on. The quality of the unit is steady and reliable, firm and durable, convenient operation, compact structure. It can meet the technique demands of plastics production. It is an ideal equipment of plastics product trade.