This article describes the coaxial electrospinning technique used in additive manufacturing to obtain core-sheath polymer line. In this study, we use finite element analysis method to simulate electric field distribution near the coaxial spinning mouth, and use the PVA material in laboratory electrospinning equipment to obtain core-sheath line width in the range of tens to hundreds μm. With this study, we can overcome the width limitations of traditional additive manufacturing, and expand the application field.