The present invention relates to the preparation methods that ivabradine sulfate and its I types crystallize. Specifically, the present invention relates to ivabradine sulfate and preparation method thereof and the stable crystal form I of ivabradine sulfate and preparation method thereof.本發明涉及硫酸伊伐布雷定及其I型結晶的製備方法。具體而言,本發明涉及硫酸伊伐布雷定及其製備方法,以及硫酸伊伐布雷定的穩定晶型I及其製備方法。