The invention discloses a local grade voltage safety control method and device for an electric vehicle charging load. The local grade voltage safety control method comprises the steps that control parameters of local grade voltage safety set by a power grid dispatching center is obtained, and the control parameter comprises a strengthening control start threshold value and a low voltage load shedding technology start threshold value; a real-time high-voltage side bus bar voltage value Vt in a local grade transformer substation is collected; a current moment is assumed to be t=0, a control strategy is determined according to the first current high-voltage side bus bar voltage value Vt, the strengthening control start threshold value and the low voltage load shedding technology start threshold value, and the safety control is performed on the local grade voltage according to the control strategy. According to the local grade voltage safety control method and device for the electric vehicle charging load, through modes that the high-voltage side bus bar voltage of a transformer substation and real-time charging power of a subordinate electric vehicle charging station of the transformer substation and other related information are collected, and the charging power of the subordinate electric vehicle charging station of the transformer substation is controlled, the network voltage safety is guaranteed, the voltage stability of the electric system is optimized, and the risk of voltage collapse of the electric system is reduced.