The invention relates to a protection method of a DC electricity transmission high-voltage convertor station, which is used for protection of the DC electricity transmission high-voltage convertor station in the field of electricity transmission and transformation and divides the defects existing in a high-voltage convertor station into three levels of a convertor station system level, a convertor device level and a unit convertor level to design. When a DC electricity transmission system generates the defects, the system sorts and transfers the defects by a defect library, grades the defects according to different defect sorts, carries out corresponding processing and carries out corresponding alarm and action. The protection method can carry out grading comprehensive protection for the high-voltage convertor station. When the defects occur, the system can rapidly query the types of the defects and then carry out corresponding judgment and action for the defects according to the system protection levels, so the protection method reliably and effectively protects the DC electricity transmission system and can minimize the shock impact of the transient disturbance of the high-voltage convertor station on the DC electricity transmission system.