The invention provides a ceramic 3D printing material preparation device and a preparation method, and relates to a raw material preparation technology. The ceramic 3D printing material preparation device and the preparation method solve the problem about ceramic clay raw material impurity removal in the prior art. The ceramic 3D printing material preparation device comprises a ceramic raw material filter barrel. The ceramic raw material filter barrel comprises a cylindrical filter barrel and a filter screen arranged at a lower end opening of the filter barrel. A rotary shaft which penetratesthe filter screen and can rotate relative to the filter screen is arranged at the position of the center axis of the filter barrel. Iron gathering rods diverged outwards with the rotary shaft as the axis are connected to the rotary shaft. The iron gathering rods and the rotary shaft are all soft magnets. An electromagnet for controlling the magnetic field intensity of the rotary shaft is arrangedon the rotary shaft. The rotary shaft is connected with a motor shaft and controlled by a motor to rotate. A groove extending outwards in the radial direction of the filter barrel is arranged in the circumferential direction of the filter barrel. According to the ceramic 3D printing material preparation device and the preparation method, by means of the device capable of adsorbing irony impuritiesand capable of fast throwing away the adsorbed irony impurities through centrifugal force, the irony impurities can be fast cleared away, and convenience, rapidness and repeated utilization are achieved.