The invention relates to a recycling system of chlorination mother solution and a recycling method thereof in an automatic anion exchange resin production system, white ball and chloromethyl ether are sent to a chloromethylation reaction kettle respectively by an airflow transmitting system and pump transmission, stirring is carried out at normal temperature; after inflating, ferric trichloride dissolvable in the chloromethyl ether is added for catalysis, and exothermic reaction is generated, the adding speed of the chloromethyl ether is regulated according to temperature, chlorine ball is prepared after the temperature is raised to 48 DEG C and temperature insulation is carried out for 10 hours, temperature reduction is carried out, the separated chlorine ball is washed sequentially by chloride methanol for two times, and by methanol for one time; then, solid-liquid separation is carried out, solid-phase chlorine ball enters amination reaction, liquid-phase chlorination mother solution and chlorine ball cleaning solution enter a chlorination liquid recycling reaction kettle, chloride methanol generated in the chlorination liquid recycling reaction kettle enters a chloromethyl ether reaction kettle; and then, solid methanol and chlorine hydride are added in the chloromethyl ether reaction kettle for reaction, chloromethyl ether volatilized in the reaction process enters a chloromethylation reaction kettle after condensation by a condenser, and noncondensable gas enters an alkali spray tower for absorption treatment.