The invention discloses a 330kV dry-type capacitive current transformer and a preparation method thereof. The 330kV dry-type capacitive current transformer comprises a U-shaped primary main insulator,secondary windings, a secondary wiring board, a shell, a base, a voltage equalizing device and primary wiring terminals; the U-shaped primary main insulator comprises a U-shaped conducting rod, a capacitive insulating layer, an outer sheath and an umbrella skirt; the capacitive insulating layer wraps the U-shaped conducting rod; an outer sheath and an umbrella skirt are sequentially arranged outside the capacitive insulating layer; the top ends of two arms of the U-shaped primary main insulator are each provided with a voltage equalizing device; the primary wiring terminals are mounted on thevoltage equalizing devices; an insulating material in the capacitive insulating layer is polytetrafluoroethylene; the secondary windings are sleeved at preset positions on two sides, close to the bottom end, of the U-shaped primary main insulator in a penetrating manner, and the secondary windings are positioned in the shell; and the secondary wiring board is used for leading outgoing lines of the secondary windings from the inside of the shell to the outside of the shell. The current transformer is more reasonable in insulation structure, the mechanical strength and the electric appliance performance are more excellent, and the requirement of the 330kV voltage level can be met.