The invention relates to a hydraulic push-in replacing device for a current transformer. The hydraulic push-in replacing device for the current transformer is characterized by comprising a base (4). The base (4) is fixedly provided with a hydraulic jack (6); both sides of the hydraulic jack (6) are respectively provided with a support pillar (7); the bottom part of each support pillar (7) is hinged to the base (4). The hydraulic push-in replacing device for the current transformer also comprises a support platform. The lower bottom face of the support platform is fixedly provided with a connecting yoke (3); the connecting yoke (3) and the head part of a piston rod of the hydraulic jack (6) are hinged together, and meanwhile, the connecting yoke (3) and top parts of the two support pillars (7) are also hinged together. After the replacing device provided by the invention is adopted, manual operation is replaced. The replacing device is stable in movement, convenient to use, low in cost and basically free of maintenance cost in the later period. Workers can be reduced to 2 persons, so that the replacing time of the current transformer is greatly shortened, the working performance is improved, and the power supply reliability is ensured.