The invention provides a large V-shaped single-loop compact tower window structure. The large V-shaped single-loop compact tower window structure comprises a V-shaped tower window located at the upper end of a straight line pole. A three-phase wire in the same loop is arranged in the V-shaped tower window and arranged in an inverted equilateral triangle mode. The three-phase wire arranged in the inverted equilateral triangle mode is correspondingly provided with an equilateral-triangle-shaped insulator chain, and variant lengthened insulator chains are connected to the two sides of the equilateral-triangle-shaped insulator chain, so that a five-linkage insulator chain is formed. The side length of the equilateral-triangle-shaped insulator chain depends on the distance requirement between straight line poles, and the total length of the variant lengthened insulator chains connected to the two sides of the equilateral-triangle-shaped insulator chain depends on the position of a hanging point of the tower window and the spatial position of the upper intersection point of the equilateral triangle; and the large V-shaped single-loop compact tower window structure has the characteristics of being reasonable and compact in structure, convenient to install and use, capable of meeting standard design requirements and the like.