The work aims to adjust the printability of liquid metal based inks and apply it to develop the printing method of stretchable electrodes. The diameter and surface tension of liquid metal particles were reduced by ultrasonic crushing. The effects of different types and contents of polyurethane on the dispersibility of liquid metal particles, ink rheology, and the printability and stretchability of printed electrodes were investigated. The liquid metal ink prepared by introducing PU1185 could achieve an electrode resolution of 58 µm through screen printing. The printed electrode exhibited good conductivity and stretchability. After pre-stretching and stabilizing, the electrode could be stretched 1 000 times under 100% strain, and its resistance change did not exceed 2 times. Liquid metal-based inks can be used for high-resolution circuit processing, which also indicates that liquid metal-based inks have foreseeable broad application prospects in stretchable electronics.