The invention relates to a leakage guide device at the bottom of a phosphogypsum yard for achieving wet discharge film paving leakage prevention, and belongs to the technical field of chemical facilities. The device is composed of a preliminary-stage dam, leakage guide blind ditches, a stainless steel pipe and solid wall pipes, wherein the leakage guide blind ditches comprise the two transverse leakage guide blind ditches parallel with the axis of the preliminary-stage dam and one longitudinal blind ditch perpendicular to the transverse leakage guide blind ditches; the distance between the first transverse leakage guide blind ditch and the dam foot of the preliminary-stage dam is not less than 50 meters; the distance between the second transverse leakage guide blind ditch and the first transverse leakage guide blind ditch is not less than 50 meters. The device effectively drains saturated water inside ardealite in the yard into a downstream water pool under the condition of not damaging a leakage prevention system of the phosphogypsum yard, accelerates drainage consolidation of the ardealite, increases the physical-mechanical index of the ardealite and ensures the operation safety of the phosphogypsum yard.