The invention relates to the field of environment-friendly devices, in particular to a wet type electric dust collector suitable for positive-pressure operation conditions. A smoke inlet section, a dust collecting and fog removing section and a smoke outlet section are sequentially arranged in the smoke airflow direction. One-way valve plate type airflow distributing plates and a cathode wire limiting frame are arranged in sequence in the smoke airflow direction in the smoke inlet section. The dust collecting and fog removing section is provided with anode tubes and cathode wires arranged in the anode tubes. A cathode wire lifting frame and a smoke outlet are formed in the smoke airflow direction of the smoke outlet section. The one-way valve plate type airflow distributing plates comprise fixed plates and movable plates which are arranged on the fixed plates, wherein smoke through holes are distributed in the fixed plates, and round holes communicated with the smoke through holes are formed in the movable plates. Positive pressure of smoke at an air inlet of the wet type electric dust collector can be balanced through the wet type electric dust collector, an inlet and outlet airflow distribution effect can be ideal, the flow speed of smoke in an anode room is consistent, an expected dust removing and SO3 acid mist removing effect can be achieved, and wide application prospect is achieved.