The present invention provides ballast water treatment equipment which can decompose fungicide included in ballast water and reduce the amount of use of fungicide adsorbing material by passing through the ballast water.The ballast water treatment equipment for supplying ballast water to a ballast tank through a fungicide adding device, comprises: a shear flow generator put in an intake pipe from an intake opening to the ballast tank, and receiving ballast water from a high pressure pump; and a swirl flow generator connected to downstream of the swirl flow generator with a connecting pipe; wherein the shear flow generator has one or more venturi tubes with recesses arranged in parallel; each the venturi tube with recess comprises an inlet side cross-sectional area reducing part gradually decreasing sectional area along a flow direction; an outlet side cross-sectional area enlarging part put in downstream of the inlet side cross-sectional area reducing part, and increasing cross-sectional area along the flow direction; a throat put between the inlet side cross-sectional area reducing part and the outlet side cross-sectional area enlarging part; and a shear flow generating recess opening to the throat; wherein the swirl flow generator has a cylinder being aslant connected the connecting pipe of the shear flow generator to its outer lateral surface; and a diffuser pipe having an inner circumference surface increasing cross-sectional area along the flow direction and connected to the fungicide adding device through an intake pipe.