The invention discloses polyamide molding composition. The composition comprises components as follows: a, 30wt%-99.9wt% of polyamide resin with the pH value smaller than 7 in phenol; b, 0-70wt% of reinforcing filler; c, 0-70wt% of an additive and/or other polymers, wherein the sum of weight percentages of the three components a, b and c is 100wt%. With the adoption of the polyamide molding composition prepared from the acid polyamide resin with the pH value smaller than 7 in the phenol, the condition that the polymer is degraded to produce gas during injection molding can be effectively prevented, then technical problems of flow lines, local whitening and the like of products are solved, and meanwhile, the color of the polyamide molding composition is improved.