The invention discloses a CTR energy storage system battery rack which comprises a bottom cross beam plate and a top cross beam plate, the bottom cross beam plate and the top cross beam plate are fixedly connected through eight vertical supporting columns, every two of the eight vertical supporting columns are combined into three rows, each row of vertical supporting columns is composed of seven layers of battery module supporting structures, a main air duct located in the rear side of the vertical supporting column is arranged between the bottom cross beam plate and the top cross beam plate, a fan set is assembled on the top of the top cross beam plate, and the input end of the main air duct communicates with the fan set. According to the CTR energy storage system battery rack, the step of assembling the middle cross beam and the interlayer metal plate can be omitted, the material cost can be reduced, the CTR energy storage system battery rack is light in weight, meanwhile, the operation complexity degree of assembling can be reduced, in addition, the main air duct is detachably arranged, multiple heat dissipation modes can be conveniently switched, and the situation that a battery system support needs to be additionally developed again due to different heat dissipation modes of an existing device is avoided.