The invention discloses a light-colored rosin resin specially used for depilatory wax and a preparation method of the light-colored rosin resin. The light-colored rosin resin specially used for the depilatory wax is prepared from the following raw materials by weight percent: 35-40% of refined rosin, 4-6% of trimethylolpropane, 0.05-0.2% of an antioxidant tetramethylbenzidine (TMB), 0.05-0.15% of a stabilizing agent and 55-60% of base oil. The preparation method comprises the steps of: adding the refined rosin and the trimethylolpropane into a reaction kettle together for reaction; after the reaction, adding the antioxidant into the product for reaction again; sampling and detecting the acid value; after the acid value is qualified, vacuumizing to remove the rest small molecule compounds; cooling, adding the base oil into the product, and evenly stirring; adding the stabilizing agent into the mixture, evenly stirring, then cooling and packaging to obtain the product. The light-colored rosin resin has better toughness and adhesiveness, can be used after being mixed and then coated on a depilatory paster, and is convenient and fast in the later production process, free from pollutant emission, safe and environment-friendly; and the light-colored rosin resin disclosed by the invention has the advantages of saving cost and resources, and protecting the environment.