The invention provides a flexible locating device for riveting cone shell segment wall plate products. The device comprises a fixed type enclosing frame, a variable swing fixture, a transmission structure and a support clamping part. The fixed type enclosing frame comprises a frame-shaped bracket body and a vertical locating plate. The vertical locating plate is fixed to the center of the bracketbody and is perpendicular to the bottom of the bracket body. The transmission structure comprises a motor, a horizontal transmission shaft, vertical transmission shafts, transmission assemblies and ahand wheel. The variable swing fixture is arranged in the bracket body and comprises a sliding connection plate and swing assemblies. By means of the flexible locating device, the assembling state canbe adjusted according to variation of structural boundary dimensions of the cone shell segment wall plates product so that the flexible locating device can be adapted to the wall plate products of different diameters, heights and taper degrees, and rapid locating and flexible assembling of the cone shell segment wall plate products are achieved.