A 35kV-level vegetable insulating oil H-level insulating power transformer comprises a transformer box, iron cores, coils, a layer insulator and a transformer lead guide clamp. Each coil comprises a high-voltage coil and a low-voltage coil, wherein a main hollow way is arranged between the high-voltage coil and the low-voltage coil. The box is filled with insulating oil and the insulating oil is vegetable insulating oil. Each main hollow way is internally provided with a stay curtain. Each stay curtain is made of a diphenyl ether insulating board and a diphenyl ether insulating strip. The layer insulator is made of organic silicon impregnated glass-fiber cloth. A high-voltage wire of each high-voltage coil is an imine enamelled round copper wire. A low-voltage wire of each low-voltage coil is a paper-covered flat type copper wire. The allowable temperature rise of the 35kV-level vegetable insulating oil H-level insulating power transformer is increased largely, and the transformer can save a lot of materials.