Abstract: A grease guiding tray for a kitchen ventilator includes a tray unit and an annular fence member. The tray unit includes an annular plate with inner and outer peripheral edges, an inner ring which projects upwardly from the inner peripheral edge and which has a top end formed with an annular flange that extends radially inward and then upward, an outer ring which projects upwardly from the outer peripheral edge and which cooperates with the inner ring so as to confine an annular recess therebetween, and an annular partition which projects upwardly from the annular plate and which extends into the annular recess between the inner and outer rings. The partition is formed with at least one notch, while the outer ring is formed with a radial opening. The fence member includes an annular surrounding wall that diverges gradually from a bottom end thereof, and an annular base plate that is connected to and that inclines upwardly from the bottom end of the surrounding wall.