Grading type electrostatic dust collection device with multi-stage aperture

The invention relates to the related technical field of environmental protection equipment, discloses a multistage aperture progressive electrostatic dust collection device, and aims to solve the problems that the dust filtering efficiency in a pre-filter is low and the temperature is too high to intensify the damage of parts, a plurality of gas filtering plates which are arranged at equal intervals are arranged in a pre-dust collection box, and the apertures in the gas filtering plates are gradually reduced, so that the dust collection efficiency is improved; therefore, the flue gas dust is filtered step by step; when the gas filtering plate filters the flue gas, a water medium is injected into the liquid storage cavity, and the water pump is used for carrying out water flow back flushing on the gas filtering plate, so that not only can gas filtering holes in the gas filtering plate be prevented from being blocked, but also the temperature of the filtered flue gas is reduced by using the water medium, and th