A heat pipe array oil cooler comprises a plurality of heat exchanging groove sets and heat pipe heat exchangers. The heat exchanging groove sets are arranged in a heat exchanging container. The heat pipe heat exchangers operate independently. The heat pipe heat exchangers are filled with evaporated liquor. Transformer oil enters the heat pipe heat exchangers. Heat exchanging with the evaporated liquor in the heat pipe heat exchangers is carried out through several layers of heat conducting media such as heat exchanging groove pipe walls, the transformer oil and the heat pipe heat exchanger pipe walls, then the transformer oil is cooled and flows out, the evaporated liquor is heated and boiled, phase changing is carried out, generated steam is cooled and then forms liquor again, and heat exchanging circulation is formed in the heat pipe heat exchangers. The heat pipe array oil cooler comprises a plurality of heat pipe heat exchanger sets, if one set is in leakage fault, a heat pipe in fault can be disassembled or replaced independently, transformer does not need to be shut down and maintained, the operation reliability and the maintainability of a cooling system are improved.