The invention discloses a winding module for extrusion forming of a circular-ring filter. The winding module comprises a base, a die core assembly and a plate cover assembly, wherein the die core assembly and the plate cover assembly are arranged in the base, the die core assembly is provided with a placing space and comprises a first die core seat, a second die core seat and a partition block, the first die core seat and the second die core seat are respectively provided with a first inner die core, a first outer die core, a second inner die core and a second outer die core, a first step groove is formed between the first inner die core and the first outer die core, is J-shaped and inclines relative to a horizontal plane with an angle of 45 degrees, a second step groove is formed between the second inner die core and the second outer die core, is J-shaped and inclines relative to the horizontal plane with an angle of 45 degrees, a first incoming groove and a second incoming groove are formed in the base and are separately connected with the first step groove and the second step groove, and the first step groove, the second step groove, the first incoming groove and the second incoming groove are all covered by the plate cover assembly to form a first incoming passage and a second incoming passage. Two groups of coils can be directly extruded and formed on a closed circular-ring carrier to form the circular-ring filter; and moreover, the winding module is high in working efficiency and high in product quality.