110 kV vehicle-mounted transformer and assembling method

The invention relates to a 110kV vehicle-mounted transformer and an assembly method, and belongs to the technical field of transformers. According to the technical scheme, a tank wall (3) of the oil tank is of a structure with a wide high-voltage side (6) and a narrow low-voltage side (8), the oil tank is formed by combining a lower-section oil tank (1) and an upper-section oil tank (2), and the upper-section oil tank is of a stepped structure with a high transformer body side (9) and a low on-load tap-changer side (10); and the high-voltage ascending flanged base (11) is obliquely welded on the side wall of the oil tank, and the high-voltage neutral point ascending flanged base (12) is welded on the on-load tap-changer side of the upper oil tank. The insulation grade of high-voltage phase lines of the transformer is 110kV, the high-voltage phase lines are arranged by being attached to the tank wall of the oil tank, and in order to guarantee the reasonability of the layout, the high-voltage head end phase lin