The invention relates to a dehydration device, especially to a rotary dehydration device for rare earth carbonate. The invention aims to provide a rotary dehydration device for rare earth carbonate to solve technical problems. The rotary dehydration device for rare earth carbonate comprises a rotary dehydration device, a movable rotation device, a material receiving cylinder, a supporting plate, an up-down cylinder and the like. The material receiving cylinder is arranged below the movable rotation device. The supporting plate is arranged below the material receiving cylinder, which is arranged on the supporting plate. The middle part of the bottom of the supporting plate is connected to the upper end of a telescoping rod of the up-down cylinder by a welding mode. A pedestal I is arranged at the left side of the up-down cylinder. By the rotary dehydration device for rare earth carbonate, rare earth carbonate can be rapidly dehydrated, and the dehydration efficiency is high and the effect is good. Through the movable rotation device, the rotary dehydration device can be conveniently combined and separated.