The invention discloses a stable ivabradine hydrochloride crystal (formula I), which is verified by a DCS differential thermal analysis chart, a melting point and an X-ray powder diffraction diagram. By adopting the method, the ivabradine hydrochloride crystal (formula I) prepared by the method is very stable to temperature, illumination and humidity, thus being favorable for long-term storage. The solvent used in the crystal is safe, and is easy to be removed; therefore, the stable ivabradine hydrochloride crystal is applicable to industrialized production.