The invention discloses a Czochralski crystal growth furnace, belongs to Czochralski crystal growth devices, and solves the problems of instability caused by the asymmetric flowing of cooling gas in the existing Czochralski crystal growth furnace and aggregation of inclusion impurities in melt in crystals. The Czochralski crystal growth furnace comprises a furnace body, a base, an inner thermal insulating layer, an electromagnetic induction heater, a furnace cover, a crucible, a crucible cover and a seed rod, wherein a crucible rectifying tube is fixed in the crucible; rectangular holes are uniformly formed in the lower end of the crucible rectifying tube along a circumference; the lower part of the seed rod is connected with a heat insulating ring through ribs which are uniformly and radially distributed in the radial direction; the heat insulating ring is annular; the outer diameter of the heat insulating ring is matched with the inner diameter of the inner thermal insulating layer. The Czochralski crystal growth furnace is simple and reliable in design, can effectively adjust the flow field of the cooling gas and the melt, further improve the temperature field, and improve the stability in the growth process, is beneficial to improving of the growth efficiency of high-quality crystals, reduces the cost, and is applied to the crystal preparation in various different temperature gradient growth conditions.