The utility model relates to the technical field of turbine installation. The center calibration device for steam turbine installation comprises a laser emitting device, a center calibration device body and a laser receiving device which are arranged from left to right, the laser emitting device and the laser receiving device each comprise a wheel disc, an installation base and an adjusting supporting mechanism, the wheel discs are installed on the installation bases, and the installation bases are installed on the adjusting supporting mechanisms; at least four laser transmitters are installedon a wheel disc of the laser transmitting device, and a laser receiving sensor is installed on a wheel disc of the laser receiving device corresponding to the position of a laser beam. According to the utility model, the central axis of the measuring disc and the installation central line of the steam turbine are ensured to be collinear through the cooperation of the laser emitter, the laser receiving sensor and the positioning disc, then the measuring disc is rotated and the numerical value of the laser range finder is read to determine whether the cylinder body is accurately installed, thewhole calibration operation is simple, and the calibration precision is high.