Preparation method of electric wire with small-wire-diameter nylon middle cover

The invention provides a preparation method of an electric wire with a small-wire-diameter nylon middle cover, and the preparation method comprises the following steps of an extrusion step, specifically, outputting a preheated nylon middle cover raw material to an adjustment-free center type machine head through a machine screw of an extruder, carrying out heating under a first preset condition, and carrying out preliminary extrusion, and a molding step, specifically, heating the preliminarily extruded nylon middle cover raw material under a second preset condition through an eye mold, and carrying out final extrusion to form the electric wire with the small-wire-diameter nylon middle cover. According to the preparation method disclosed by the invention, an extrusion type production mode is adopted, by matching with the adjustment-free center type machine head, a plain-end pressure-reducing outer mold, high extrusion temperature and high screw rotating speed, the uniform thickness of the nylon middle cover is