Production process of pre-oxidized fiber core-spun yarn

The invention relates to the field of spinning, and particularly discloses a production process of a pre-oxidized fiber core-spun yarn. The process comprises the following process steps of S1, mixing polyacrylonitrile with milk casein to obtain a composite spinning raw material; S2, performing spinning by using the composite spinning raw material to obtain nascent fiber; S3, mixing zinc borate and polyoxyethylene dodecyl alcohol ether, and adding zinc oxide whiskers into a mixed solution to obtain a treatment solution, wherein the dosage ratio of the polyoxyethylene dodecyl alcohol ether to the zinc borate to the zinc oxide whiskers is 10: (1.5-2): (1-1.5); S4, heating the treatment solution, padding the treatment solution on the nascent fiber through a two-dipping and two-rolling method, performing drying, and then carrying out pre-oxidation treatment to obtain pre-oxidized fiber; and S5, taking the pre-oxidized fiber as a core, twisting the pre-oxidized fiber, then carrying out doubling and two-for-one twis