PURPOSE: A cover for oscillating classifier is provided to increase aggregate production by preventing the loss of an aggregate as a cover is formed to block a classifying space in an oscillating classifier and to block scattering dust generated during the classifying process of the aggregate. CONSTITUTION: An oscillating classifier is equipped with a mesh net and has a main body composed to be capable of classifying an aggregate by desired sizes by vibrating by the operation of a motor. A cover for an oscillation classifier has a dust collecting hole to connect a dust-collecting line for scattering dust generated during a classifying work along with an inlet connected to the supply line of the aggregate. An inner classifying area contains a cover formed to be a dipartite type with a shape separated to the left and the right allowing opening. The cover contains a couple of a binding member formed allowing attachment and removal to maintain a fixed state being contacted to the corresponding surface which crosses forming layers extending from the corresponding direction to each other.