The utility model belongs to the technical field of bearing detection and discloses a measurement device for radial pulsation of a gear ring of a turntable bearing. The measurement device includes a pedestal (6), a slide block (8), a cascade main shaft (10), a gear (5) and a dial indicator (2). The pedestal (6) is mounted on the upper part of the turntable bearing. One end of the pedestal protrudes out of an inner ring (4) and is connected to the inner ring (4) fixedly. The other end of the pedestal protrudes out of an outer gear ring (3) of the turntable bearing. A U-shaped groove is arranged in an end, adjacent to the outer gear ring (3), of the pedestal. Two side wall faces of the U-shaped groove are provided with guide rails (11) fitting with the slide block (8). The gear (5) is engaged with the outer gear ring (3) and the gear (5) is supported on the slide block (8) through the cascade main shaft (10). The slide block (8) is provided with the dial indicator (2). According to the utility model, time cost for turntable bearing detection is reduced and labor cost is also reduced. Production efficiency and detection precision are improved.