The invention discloses a balancer, which comprises a bracket, a central shaft is arranged at the top of the bracket, a cross beam is arranged on the central shaft, two water tanks are arranged on thecross beam, water is contained in the water tank, a bearing is arranged in the water tank, a water floater and a platform plate are arranged on the bearing. The bottom of the bracket is in contact with a base, the top of the base is provided with a bottom groove, and a same second board is slidably mounted in the bottom groove. The top of the second board is welded with two first boards, the topof the first boards is welded with the bottom of the bracket, the bottom of the second board is fixedly provided with two first balls, the bottom of the base is welded with two supporting plates, onesupporting plate of the two supporting plates, close to one side of the other supporting plate, is provided with a mounting groove. The balancer has high practicability, through the water floater andthe platform plate, the balancer is attractive and artistic when rotating, and the height of the balancer is conveniently adjusted through the first ball and the second ball.