The utility model discloses a transformer coil trapezoidal oil channel cushion block. The oil channel cushion block is of a trapezoid shape. The utility model is characterized in that as the oil channel cushion block is of a trapezoid shape, when an electric transformer cake type low-voltage coil adopts a transposition wire or an autoadhesive transposition wire, the transposition space at the inner diameter of the low-voltage coil can be increased without a cross-stay transposition; in terms of conventional square-shaped oil channel cushion block, the circumference of the coil inner diameter turn of the coil and the coil outer diameter turn have quite a large difference, and the percentages of a cushion block compression area of the inner and outer diameter run taking up the whole turn area possess a large difference, thereby the compacting force is not even. The inner diameter side of the transformer coil is the short edge of the trapezoidal cushion block, the outer diameter side of the coil is the long edge of the trapezoidal cushion block, and the short edge is smaller than and the long edge is bigger than the width of the conventional square-shaped cushion block. Under the situation of ensuring heat dissipation property unchanged, the utility model is advantageous in that the percentage of each turn compression area is close to the same; the compacting force is even; mechanical strength is more reliable.