The utility model relates to a raft foundation structure of a narrow foundation power transmission tower, which is fixedly connected to footings of the narrow foundation power transmission tower. The raft foundation structure comprises a foundation plate and an installing slot, wherein the installing slot is arranged on the foundation plate and is of a #-shaped structure, and four connecting points are provided and connected with bulges of the footings of the narrow foundation power transmission tower. Compared with the prior art, the raft foundation structure has the advantages of relative simple requirement of equipment in a construction process so that earthwork exaction is carried out by adopting manual operation or mechanical operation, lower requirement of foundation rib distribution, and little influence of environment during construction.