The invention provides a special cheese whey draining tank and belongs to the technical field of milk products. The special cheese whey draining tank comprises a tank body with a feeding hole in the top, wherein a mixing paddle and a filtering mechanism are arranged in the tank body; the filtering mechanism comprises a supporting plate and a nonwoven filtering net on the supporting plate; the edge of the supporting plate is hermetically connected with the inner wall of the tank body; a plurality of small holes are formed in the supporting plate; a low-point discharge valve is arranged at the bottom of the tank body. The special cheese whey draining tank is ingenious in design, and can be used for timely discharging cheese whey out of the tank body and finishing whey draining and filtering operations in one step, and thus the working efficiency is greatly improved.