The work aims to develop a silver/phenoxy resin based conductive screen-printing silver paste used for silica glass fiber fabric substrates to prepare flexible electrodes with strong mechanical and electrical properties, discuss the factors affecting the conductivity of the electrode. The conductive silver paste was prepared with phenoxy resin with high toughness and good adhesion to glass as the organic carrier, micrometer scale flake silver powder as the main conductive filler, ultrafine silver powder as the auxiliary conductive filler, and low volatility DBE as the solvent. The ratio of silver paste components was optimized by comparing the volume resistivity of different electrodes. The mechanical properties of the electrodes were characterized by bending experiment, the temperature stability of the electrodes was studied by heating experiment, and the effects of high-temperature sintering and electromagnetic induction sintering on the electrodes were compared. When the silver paste contained 50% flaky silver powder and 10% ultra-fine silver powder, the volume resistivity of the electrodes after printing was 1.75 × 10–5 Ω. cm, which was the lowest, and the thixotropy met the requirements of screen printing. The adhesion between the electrodes and the substrates reached level 5B, and the resistance change rate after bending was < 3%. The conductivity of the electrodes was increased by 51.54% after sintering at 220 ℃, but the sintering time was as long as 1 h. After electromagnetic induction sintering, the electrical conductivity was increased by 46.7% in 14 s. The combination of silver powder with large and small particle sizes can improve the packing density of silver particles in the printed electrodes on the surface of quartz glass fiber fabric, which is conducive to the realization of good electrical conductivity and stability of the electrodes. The electromagnetic induction sintering method can further improve the electrical conductivity of the electrodes rapidly. The flexible electrode preparation method proposed in the work is expected to provide important technical support for the multi-functional and intelligent development of aerospace materials.