The invention discloses easy-to-disperse permanent yellow pigment for waterborne printing ink of a PVC (Polyvinyl chloride) color film and a preparation method of the pigment. The pigment comprises permanent yellow and a coating material coating the surface of the permanent yellow; the coating material is prepared through modification of polypropylene glycol, wherein the polypropylene glycol is acarrier carrying coating and physical properties; Q is a carrier of a functional group; a group of a Q molecule is connected onto a side chain of the polypropylene glycol through certain chemical reaction means; the pigment can be easily dispersed in water and can have good binding force with a PVC substrate and a PVC coating film at the same time due to the hydrophilic dispersion and bonding functions of the Q molecule, so that the pigment can be uniformly dispersed, and has good dispersion stability in the waterborne printing ink, and finally, the color accuracy, adhesive force and tear growth resistance of printing all achieve an expected effect.