In this work, the effect of cryogenic coupled magnetic field (CCMF) treatment on the microstructure and mechanical properties of Ti-6Al-4V titanium alloy is investigated. The titanium alloy was subjected to different magnetic induced intensities (B) and under different treatment temperatures. The results show that the volume fraction of the β phase decreases with both a reduction in treatment temperature and an increase in B value. The CCMF-treated samples exhibit a higher dislocation density compared to those treated with cryogenic fields alone. When compared to samples that underwent either single cryogenic treatment or single magnetic treatment, the CCMF-treated samples demonstrate a lower ultimate tensile strength but a higher elongation. The integration of cryogenic and magnetic fields can significantly enhance the plasticity of the samples. In general, CCMF treatment can effectively enhance the plasticity of the samples while maintaining the material's strength, representing a promising new treatment method for titanium alloys.