The invention relates to the technical field of transformers, and discloses a transformer for power transmission and distribution. The transformer comprises a lower clamping plate. According to the transformer for power transmission and distribution, a cold air conveying hopper is mounted at an air outlet of a fan to collect and convey cold air in a centralized manner, and the air volume of the fan can be completely utilized. An air distributor is mounted at one end of the cold air conveying hopper, and an air outlet which has the same width as a cold air duct between a high winding and a lowwinding and corresponds to the cold air duct in position is formed in the air distributor. Because the capacity at the height of the air distributor is smaller than the capacity at the same height inthe cold air conveying hopper, the air speed will be increased due to the reduction of the air outlet when cold air passes through the air outlet of the air distributor. Because the side of the air distributor in the vertical direction and the vertical line form a 45-degree angle, cold air entering from the air distributor enters the cold air duct at a 45-degree angle, turbulence of main flow fluid in the cold air duct can be realized through a first flow guide ring and a second flow guide ring in the cold air duct, the heat exchange efficiency in the cold air duct can be improved, and the heat dissipation of the winding can be improved.