The invention discloses a polyamide mold composition, which consists of at least one polyamide resin, glass fiber, hydro-oleophobic master batches, a heat stabilizer and other additives, wherein the melting point of the polyamide resin is between 270 DEG C and 340 DEG C, and the relative viscosity of the polyamide resin, measured by 96 percent concentrated sulfuric acid at the temperature of 25 DEG C, is between 2.0 and 2.4. The composition is prepared by the following steps of: preparing the hydro-oleophobic master batches; extruding and pelletizing; drying and uniformly mixing the obtained hydro-oleophobic master batches with the polyamide resin, the heat stabilizer and other additives by using a high speed mixer; adding the mixture through a main feeding hole of a double screw extruder; adding the glass fiber from a second feeding hole of the extruder; and extruding and pelletizing at resin melting temperature, and drying to obtain a corresponding polyamide mold composition. The invention has the advantages that: 1, the hydro-oleophobic master batches are added into the polyamide resin, so that the physical corrosion resistance and the mechanical property of the polyamide mold composition can be enhanced; and 2, a fluorine-containing copolymer in the master batches is beneficial to the dilution and the dispersion of the fluorine-containing copolymer in the master batches during secondary processing.