The invention relates to a M<y>(C<X>N<1-X>) powder rotary type dynamic continuous preparation method and a sintering device, wherein in the chemical formula of M<y>(C<X>N<1-X>), M is one of Ti, Cr, V, Ta, Mo, Nb, Zr, Hf, W and Mn, y is 1 or 2, X is greater than or equal to 0.1 and smaller than or equal to 0.9, and the preparation method comprises the following technological steps: (1), compounding, wherein the raw materials comprise compound powder of M and O and a reducing agent; (2), mixing and drying; (3), sintering, in an open system or closed system, a furnace tube is heated under the condition that the furnace tube is in a sloping state in which a discharge opening is lower than a feed opening and a rotation state, when the temperature in the furnace tube reaches the reaction temperature, the powder mixture obtained in step (2) is continuously fed into the furnace tube, the powder mixture, after entering the furnace tube, completes reaction in a manner of performing helical motion through a furnace tube heating area to form a reaction product to falls into a collecting chamber. According to the M<y>(C<X>N<1-X>) powder rotary type dynamic continuous preparation method and the sintering device, provided by the invention, single-phase M<y>(C<X>N<1-X>) powder can be obtained and continuous batch production can be realized.