The invention provides a generator cooling device with vertical low-resistance heat pipes. The generator cooling device comprises a plurality of heat pipes, a hot side circulating fan and a cold side water tank; the cold side water tank is provided with a cold water inlet and a hot water outlet; the heat pipes are arranged on a top plate of a generator room and are divided into two parts each; condensation ends of the heat pipes are located in the cold side water tank and evaporation ends of the heat pipes are located in the generator room; the hot side circulating fan is arranged in the generator room and above a generator; the outer wall of each heat pipe is provided with multiple layers and multiple rows of thready bending heat exchange members with high density; each thready bending heat exchange member is characterized in that a metal wire is bent for four times to form a first bending part, a second bending part, a third bending part, a fourth bending part and a fifth bending part and is welded to the outer wall of the corresponding heat pipe via the first bending part and the fifth bending part. The heat pipes are used as the heat exchange components, so that the generator can be cooled rapidly; the condensation ends of the heat pipes are located in the cold side water tank, so that heat generated by the generator can be fully utilized and energy is saved.