Rotor hoisting and positioning device of hydro-generator and positioning method thereof

The invention discloses a rotor hoisting and positioning device of a hydro-generator and a positioning method thereof. The rotor hoisting and positioning device of the hydro-generator is provided with a rotor and a stator of the hydro-generator to be installed, four to eight groups of laser beam emission devices are symmetrically arranged on side walls on the periphery of the rotor, and scale detecting devices matched with the laser beam emission devices are symmetrically arranged on the periphery of the inner wall of the stator. The positioning method comprises the steps that the laser beam emission devices and the scale detection devices are installed and regulated, the rotor is hoisted and moved and then positioned through the device, data of the distances between laser beams and focal points of scale detection surfaces are regulated to be the same, and the rotor is put downwards to be in place. According to the rotor hoisting and positioning device and the positioning method, alignment checking in rotor h