The invention provides a gel centrifugal hard alloy bar forming machine and a bar forming preparation method, wherein the method is characterized in that a hard alloy slurry is prepared by using a gel-casting method, and the forming of hard alloy bars is implemented by using a self-made gel centrifugal bar forming machine. The forming machine is composed of a support (1), a lower mold base (2), ahigh-speed adjustable DC (direct current) motor (3), a connecting flange plate (4), a molding mold (5), an upper mold base (9), a plastic pipe (8), a slurry spur (10), a filling hopper (11) and a hopper support (12); and the forming machine is characterized in that the mold for forming agents is of a split design and composed of a filling hole and a molding hole, and fixed by the upper and lower bases so as to facilitate the replacing of the mold; a blank is formed in the plastic pipe, therefore, the blank is easy to demold; and the forming machine is of a vertical design, therefore, the integration of filling, centrifugation, forming and solidification can be realized, and the industrial production of hard alloy bars can be realized. Compared with the traditional hard alloy extrusion molding machine, the gel centrifugal hard alloy bar forming machine provided by the invention has the advantages of low binder content, easiness in degumming, high finished product ratio and low cost.