The invention belongs to the technical field of screening of vibrating screens, and particularly relates to a method for improving the screening efficiency of a vibrating screen. The vibrating screencomprises a screen stencil, a belt conveyor and a speed reducer connected with a motor. The method comprises the following steps: selecting the screen stencil, adjusting the angle of inclination of the screen stencil, adjusting the ore feeding capacity, adjusting the speed reducer to change the vibration speed of the vibrating screen, and observing the thickness of a to-be-screened material layerof the vibrating screen, thereby determining the feeding speed and the ore feeding capacity of the belt conveyor. According to the method, the vibrating screening efficiency is improved by selecting the proper screen stencil to reduce blocking of screen meshes; the transmission ratio of the speed reducer is adjusted at the proper time, so that the circulating load of the vibrating screen is reduced, and the vibrating screening efficiency is improved; the circulating load of the vibrating screen is reduced by adjusting the screening angle of the vibrating screen; and the feeding speed and the ore feeding capacity of the belt conveyor are adjusted by adjusting the to-be-screened material layer to improve the screening efficiency of the vibrating screen.