The utility model discloses a current transformer device that can install with electricity fast, including mutual -inductor bracket and mutual -inductor, the mutual -inductor bracket includes mechanical part, insulating subtotal operation section, mechanical part includes the head rod and all overlaps and establish last mould and the bed die on the head rod, the mutual -inductor includes personally experiences sth. Part of the body with the measurement of measuring induced -current numerical value with the exchangeable inductor of external cable, the inductor is connected through the wire with the measurement body, the inductor includes first casing, can dismantle the second casing of being connected and set up the winding in first casing and second casing with first casing. The utility model discloses a current transformer device that can install with electricity fast, through setting the mutual -inductor to first casing, second casing and the setting through mechanical part, insulating part and operation section, alright installed current transformer with quick effectual electrification.