The invention provides a double-ring oil-immersed power transformer with 1000kV high-voltage winding split. The double-ring oil-immersed power transformer comprises an oil tank, an oil storage cabinet, a sleeve, cooling equipment, secondary protection equipment, a non-excitation voltage regulating switch, an iron core, a winding assembly and a lead. The winding assembly comprises a voltage regulating winding, a first high-voltage winding, a first low-voltage winding, a second low-voltage winding and a second high-voltage winding which are sequentially arranged from inside to outside; the voltage regulating winding is close to an iron core main column, and insulating cylinders and supporting strips are arranged between the voltage regulating winding and the iron core main column, between the adjacent windings and between the second high-voltage winding and an iron core side column. The voltage regulating winding is connected in series with the first and second high-voltage windings to form a high-voltage winding part of the transformer; the first and second low-voltage windings are connected in series to form a low-voltage winding part of the transformer. Through the overall structural design, the problem that in the prior art, a 1000kV double-ring oil-immersed power transformer is high in transportation height is effectively solved, and the switch is low in insulation level, loss, noise and temperature rise and high in insulation reliability.