The invention relates to a method for preparing a wear-resistant cast steel bucket tooth, which belongs to the technical field of metal wear-resistant materials. The prior bucket tooth and the processing technique thereof have the problems of high cost, complex technique and the like. In the method, tinplate leftover material, high carbon ferro-chrome, mid-carbon ferromanganese, silicoferrite, ferroboron, ferrozirconium and ferrotitanium are mixed up respectively according to the following mass percent: 96.3 to 97.0 percent, 1.5 to 1.8 percent, 0.8 to 1.2 percent, 0.4 to 0.6 percent, 0.025 to 0.035 percent, 0.045 to 0.055 percent and 0.18 to 0.25 percent; the mixture is compacted by a forcing press to form a quadrel which is then put in an induction furnace for heating and melting down and is cast to form the bucket tooth in a cere shuttering; the bucket tooth is put in water directly for cooling after being congealed, and is tempered under the low temperature at last to obtain the wear-resistant cast steel bucket tooth. The method for preparing the wear-resistant cast steel bucket tooth has the advantages of low manufacture cost, high productivity effect, long service life of the bucket tooth, etc.