The invention provides a stable hydrochloric acid Ivabradine II crystal form, a thermogravimetry spectrogram shows that each part of hydrochloric acid Ivabradine molecule contains 0.5 parts of crystal water. The differential scanning calorimetry (DSC) spectrum diagram shows that a large endothermic peak is generated at -154 DEG C, a heat release peak is generated at -160 DEG C, wherein the fusion decomposition temperature is 194 DEG C (summit value), wherein the hydrochloric acid Ivabradine II crystal form is a monoclinic system, its space group is P21, the cell parameter comprises: a=5.48740(10)Angstrom, b=43.4767(7)Angstrom, c=11.4892(2)Angstrom, beta= 98.144 (2) degrees, and a crystal cell volume is 2713.38(8)Angstrom<3>. A characteristic diffraction spectral line of its X-powder diffraction describes hydrochloric acid Ivabradine new crystal form as II crystal form. The Ivabradine new crystal form enables difficult water absorption and deliquescence, and has the advantages of good stability and convenient storage. The preparation method is simple and easy to be carried out, a solvent with high boiling point and large toxicity is not used, the preparation method is in favor of environmental protection, is suitable for industrial production, and has large application value.