The invention discloses an improved pedestal pile self-balanced static load testing device. The self-balanced static load testing device comprises a pile hole, a reinforcing cage, auxiliary measuringsteel bars, steel bar meters, a load box, a pressurized oil pump, an upper displacement measuring rod, a lower displacement measuring rod, displacement measuring devices and a data acquisition device;the reinforcing cage extends into the pile hole; the auxiliary measuring steel bars are located in the reinforcing cage, and the auxiliary measuring steel bars are cut off at variable cross section positions and are connected with the steel bar meters in a binding mode; the load box is located at the bottom of the pile hole; the pressurized oil pump is located on the outer side of a cavity and communicates with the load box through an oil pipe; the upper displacement measuring rod and the lower displacement measuring rod are embedded into the pile hole correspondingly and are fixedly connected with an upper top plate and a lower bottom plate of the load box respectively; the displacement measuring devices are installed at the top of the upper displacement measuring rod and the top of thelower displacement measuring rod; and the data acquisition device is used for receiving data information acquired by the steel bar meters and the displacement measuring devices. The invention furtherdiscloses an improved pedestal pile self-balanced static load testing method. According to the system and the method, bearing capacity testing detection problems of electric transmission line iron tower foundations, communication tower foundations and other various kinds of pedestal piles of mountainous areas and other complicated sites can be successfully solved.