The utility model belongs to the technical field of electricity, and discloses a three-phase linear arrangement type Dy (Yy) connected capacitance-regulating transformer, which comprises an iron core,a three-phase capacitance-regulating winding and three capacitance-regulating switches, each phase of capacitance-adjusting winding comprises a high-voltage winding coil, a low-voltage winding III-section coil, a low-voltage winding I-section coil and a low-voltage winding II-section coil which are arranged in the radial direction, and the three sections of low-voltage coils are wound by conductive foils; the low-voltage winding I-section coil and the low-voltage winding II-section coil form a radial spiral laminated structure and are in 180-degree rotational symmetry along the axis; a high-voltage wiring terminal and a low-voltage wiring terminal of each capacity regulating switch are respectively arranged on two sides, and outgoing copper bars of the high-voltage winding coil and the low-voltage winding I-section coil and outgoing copper bars of the low-voltage winding III-section coil and the low-voltage winding II-section coil are upwards connected with the capacity regulating switches from two sides. Outgoing lines of the capacitance-regulating transformer are located on the upper portion, the connection distance between the outgoing lines and the capacitance-regulating switch is short, the lengths are similar, three-phase resistance is balanced, the structure is compact, the size is small, and manufacturing is easy.