The invention provides a wet-type electric precipitator and an application method thereof. The wet-type electric precipitator comprises a shell, a plurality of cylindrical anode plates, a plurality of cathode wire rings, anode plate washing nozzles and cathode wire washing nozzles, wherein the cylindrical anode plates are concentrically distributed with different diameters; the cathode wire rings are arranged at intervals with the cylindrical anode plates; cathode wires comprises four-stage pointed end cathode wires, two-stage pointed end cathode wires and acupuncture pointed end cathode wires; a plurality of cathode wires are circularly distributed in the cathode wire rings through the following order of the four-stage pointed end cathode wires, the acupuncture pointed end cathode wires, the two-stage pointed end cathode wires and the acupuncture pointed end cathode wires; the anode plate washing nozzles are annularly arranged and located above the cylindrical anode plates; the cathode wire washing nozzles are annularly arranged and located above the anode plate washing nozzles. By virtue of the wet-type electric precipitator and the application method thereof, the effective dust collection area of a solar polar plate can be increased and the smoke blind area is effectively reduced; meanwhile, an electric field is uniformly partitioned, and thus the efficient and stable operation of the wet-type electric precipitator can be guaranteed.