The invention relates to a clamping device convenient to dismount and mount of a rolling supporting assembly. The clamping device comprises a first clamping part, a second clamping part and a bottom clamping part. The three clamping parts clamp a rotary guide rail jointly, specifically, the first clamping part comprises a first clamping arm and a first baring assembly which is embedded in the first clamping arm and can rotate in the first clamping arm, the bearing surface of the first bearing assembly makes contact with the rotary guide rail, the second clamping part comprises a second clamping arm and a second baring assembly which is embedded in the second clamping arm and can rotate in the second clamping arm, the bearing surface of the second bearing assembly makes contact with the rotary guide rail, the bottom clamping part comprises a bottom clamping arm and a bottom bearing assembly which is embedded in the bottom clamping arm and can rotate in the bottom clamping arm, and the bearing surface of the bottom bearing assembly makes contact with the rotary guide rail. The technical problem that an existing clamping device cannot adapt to toppling deviation of the rotary guide rail is solved.