The invention provides a cotton adjusting plate which can adjust the thickness and the uniformity of a cotton layer on the surface of a dust cage and is applied to the working process of a condenser. The main part of the cotton adjusting plate is a sheet iron inserting plate, a rectangular cotton adjusting inserting plate is installed above the dust cage of the condenser, the width of the inserting plate is equal to that of the dust cage in the condenser, a knife edge is positioned at the lower end of the inserting plate, the knife edge faces to a cotton inlet of the condenser, the condenser extends out from the upper end of the cotton adjusting inserting plate, scales are marked so as to indicate the thickness of the cotton layer on the surface of the dust cage, the position height is determined by the size of cotton flows, and plug pin holes are drilled in both sides of the cotton adjusting inserting plate and used for adjusting the height of the cotton adjusting inserting plate and fixing the cotton adjusting inserting plate on a shell of the condenser; when the cotton adjusting plate is in working, the cotton flows enter the condenser, are adsorbed on the dust cage and flow through the cotton adjusting inserting plate, then extra cotton blocks are cut off by the knife edge of the inserting plate, and only the cotton layer with the normal thickness is permitted to pass, so that the cotton layer on the surface of the dust cage is uniform; and on the premise of ensuring the normal working of the condenser by the cotton adjusting plate, the thickness of the cotton layer on the surface of the dust cage can be effectively controlled, the thickness can be uniform, and the working stability of the condenser is improved.