Preparation method for improving oxidation resistance of polyamide

The invention belongs to the technical field of polymer materials, and particularly relates to a preparation method for improving the oxidation resistance of polyamide. The preparation method for improving the oxidation resistance of polyamide comprises the following steps: putting long carbon chain aliphatic dibasic acid, long carbon chain aliphatic diamine, an antioxidant and water into a salt forming kettle according to a proper proportion, heating under the protection of inert gas to carry out salt forming reaction for 1-3 hours, carrying out filter pressing, putting into a polymerization kettle, heating to 230-260 DEG C under the protection of inert gas, carrying out reaction for 4-7 hours, and cooling to room temperature to obtain the polyamide. And pelletizing under water to obtain the finished product polyamide. According to the invention, the raw materials are added into a salt forming kettle before polymerization reaction, and are uniformly mixed, so that the antioxidant effect is good, and the anti