The high-voltage cable metal sheath circulating current suppressor is divided into two parts, the first part is the inductance that suppresses the circulating current; the second part is the zinc oxide valve plate with protective function. When the power cable is working normally, the suppressor can effectively suppress the current of the metal sheath of the cable. When the core current increases, or when a single-phase short circuit occurs, the voltage across the inductor increases. When the voltage exceeds the protector withstand voltage, the protection The device operates to leak the induced current into the ground through the protector and clamp the voltage across the inductor in time to avoid injury to the operator and heat damage to the inductor.