A method for detecting electrospinning jets using coaxial laser assistance is proposed to address the challenges of small diameter， high speed， and difficult detection of electrospinning jets. Based on the principle of optical waveguide transmission， laser is transmitted through optical fibers to the exit of a coaxial needle and coupled with an electrospinning jet， which effectively enhances the contrast between the jet and the background. Combined with the image-processing technology， the evolutions of laser- and nonlaser-assisted electrospinning jet images were compared and analyzed. Based on this analysis， the optimal power range of the auxiliary laser was determined. The experimental results show that coaxial laser assistance can enhance jet detectability， and the most suitable laser power for jet detection is 4 mW. In the jet stabilization stage， the average visible lengths of the electrospinning jet with and without light assistance are 10.79 and 5.68 mm， respectively. Compared with nonlight assistance， the visible length of the electrospinning jet increased by 89.81% on average. For a small jet， the visible lengths of the jet with and without light assistance are 5.36 and 3.33 mm， respectively. The visual length of the jet with light assistance increased by 60.74%. Therefore， the introduction of coaxial laser can effectively improve the detectability of electrospinning jets and is a novel approach to the real-time detection for micro/nanospray printing jets.