The invention relates to a
steam turbine generator base assembling and
welding concentricity guaranteeing device. The device comprises a base, a first lead screw and a positioning rod, a stand columnis rotationally connected to the top of the base, a first transmission groove is formed in the bottom, close to the stand column, of the base, a worm gear is connected to the interior, close to the first transmission groove, of the stand column, a worm penetrates through the side, close to the worm gear, of the base, and a first motor is fixed to one side of the base. According to the
steam turbine generator base assembling and
welding concentricity guaranteeing device, after annular plates are sequentially placed, the first lead screw drives a positioning block to move towards the inner sidesof the annular plates, so that the positioning block drives the positioning rod to enter the inside of a positioning groove conveniently, through the positioning rod and the positioning groove, the annular plates and the positioning block are fixedly connected conveniently, the annular plates are positioned through the positioning block, the circle centers of the annular plates coincide with thecircle center of the stand column, the circle centers of the annular plates on different
layers coincide conveniently, and
welding of the annular plates is positioned.