The utility model discloses a hydraulic bushing centralizer which comprises a central tube, a centralizing arm and a drive device. The upper end of the central tube is connected to the lower-end inner wall of an upper connector, the lower end of the central tube is connected to the upper-end inner wall of a lower connector, the centralizing arm is arranged outside the central tube, and the drive device arranged outside the central tube and used for compressing the centralizing arm downwardly is arranged above the centralizing arm. The drive device comprises a piston, a piston bushing sleeves the outside of the central tube, the upper end of the piston bushing is connected to the lower-end outer wall of the upper connector, an annual hollow type piston cavity is formed between the piston bushing and the central tube, the piston is arranged in the piston cavity, the lower end of the piston bushing is connected with a fixing piece, and the lower end of the piston is fixed on the temporarily fixing piece through a shear pin. The hydraulic bushing centralizer serves as a complete well tube string to partially enter a well, when a certain pressure reaches during well cementing and pressure touching, the shear pin is cut through, the centralizing arm is pushed out to support the side wall of the open well, the bushing is ensured to be centered, and finally cement sheathes even in thickness are formed in gaps between the bushing and the open well.