Disclosed is a mixing head for a urethane foaming machine capable of improving the mixing efficiency of a liquid pigment with respect to a polyol-based stock solution and an isocyanate stock solution to be mixed and injected in the reaction chamber of the urethane foaming machine. The rotor assembly 600 is rotatably mounted at the end of the rotation shaft 410 extending from the motor 400, the rotor assembly 600 is an adapter 610 that can be inserted into the end of the rotation shaft 410 on one side, A rotor 620 integrally fastened to the other side of the adapter 610 by a screwing method, and an end cap 630 attached to a free end of the rotor 620, on a radial outer surface of the rotor 620. There are a plurality of stirring blades (624a, 624b, 624c, 624) is formed to protrude, the main pigment passage 650 extending vertically along the longitudinal direction of the rotor 620 at the inner central position of the rotor 620 And a plurality of pigment discharge holes 626a and 626b formed on the radial sidewall of the rotor 620 and fluidly connected to the main pigment passage 650, and the main pigment passage 650 inside the end cap 630. ) And a pigment introduction passage 632 in fluid connection with the pigment introduction passage 632. The third injection hole 702 formed at the free end of the charge injection nozzle 700 is inserted.
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