Centering device for reactor coolant pump

The utility model belongs to the field of nuclear power engineering of nuclear power stations, and particularly relates to a reactor coolant pump centering device and method, the reactor coolant pump centering device comprises a centering device support, a connecting device, a dial indicator adjusting rod and a dial indicator, the connecting device is located below the centering device support, and the connecting device is fixedly connected with the centering device support; the dial indicator adjusting rod is slidably connected with the connecting device, and the dial indicator is installed on the dial indicator adjusting rod. The device has a simple and light structure, is easy to mount and dismount, can verify and adjust the coaxiality and parallelism of the reactor coolant pump and the motor, avoids the processes of dismounting and mounting an oil tank cover on the upper part of the motor, turning and the like, reduces the occupation of a ring crane in a nuclear reactor hall in the refueling overhaul proc