The utility model relates to a bearing dismantling and installing device. The utility model discloses a hydraulic pressure feeding device, pushing devices and dismouting device, pushing devices includes first barrel, set up in first barrel piston guide bar, cover are located the piston guide bar and can be followed the piston sleeve that this piston guide bar removed, the dismouting device includes fixed column, thrust disc and gripper jaw, the fixed column sets up in piston guide bar lower extreme, the thrust disc sets up the lower extreme in piston sleeve, and these thrust disc central authorities are provided with the through -hole that is used for through the piston guide bar, the quotation thrust post of evenly having arranged under the thrust disc, the gripper jaw sets up in the piston sleeve lower part. The utility model discloses a thrust disc is installed the bearing, adopts the gripper jaw to dismantle the bearing, and the set is installed, the dismantlement function is as an organic whole, small, the portable of equipment.