The utility model discloses a wet -type electrostatic precipitator import flue water conservancy diversion, flow straightener, including communicateing elbow (4), first diffuser (5) and second diffuser (6) between desulfurization absorption tower and wet -type electrostatic precipitator in proper order, wherein, be provided with elbow department guide plate (1) on elbow (4) inner wall for the water conservancy diversion of elbow (4) inside flue gas is provided with a plurality of first diffusers department guide plate (2) on first diffuser (5) inner wall, be provided with second diffuser department flow equalize board (3) on second diffuser (6) inner wall. The verification, the utility model discloses an implement respond wellly, not only showing the homogeneity that has improved wet -typeelectrostatic precipitator import air current, reduced by a wide margin moreover that the flue advances, outlet section's pitot loss.