A hand-held laundry treating apparatus comprising: a portable body for washing a local portion of laundry item placed on a vertical plane or a horizontal plane while being in contact with the laundry item and including a housing formed in the shape of a bar having a predetermined length and forming an external appearance of the portable body, wherein the portable body includes: - a fluid feeding unit mounted inside the housing and configured to supply and collect air of a predetermined pressure to circulate the air, - a washing unit mounted inside the housing and configured to spray wash water to the laundry item and to collect contaminated water, and - a vibration unit mounted inside the housing and configured to apply vibration to the laundry item when the wash water is sprayed to the laundry item; and wherein the hand-held laundry treating apparatus further comprises: a water tank mounted at an upper side of the housing at an angle to the housing for supplying the wash water to the portable body and, at the same time, for collecting and storing the contaminated water generated from the local portion of the laundry item according to a use state of the portable body when washing the local portion of the laundry item placed on the vertical plane or the horizontal plane, wherein the water tank comprises: - a body formed in the shape of a box; - a partition wall for partitioning an internal space of the box-shaped body into a wash water storage unit for storing the wash water and a contaminated water storage unit for storing the contaminated water; and - a fastening unit formed at a lower part of the box-shaped body such that the fastening unit is fastened to the housing for defining a communication space between the wash water storage unit and the contaminated water storage unit, wherein the fastening unit comprises: an air introduction boss for supplying external air to the wash water storage unit, a wash water discharge boss for discharging the wash water stored in the wash water storage unit, a contaminated water introduction boss for introducing the contaminated water into the contaminated water storage unit, and an air collection boss for discharging the air introduced into the contaminated water storage unit together with the contaminated water. - a fluid feeding unit mounted inside the housing and configured to supply and collect air of a predetermined pressure to circulate the air, - a washing unit mounted inside the housing and configured to spray wash water to the laundry item and to collect contaminated water, and - a vibration unit mounted inside the housing and configured to apply vibration to the laundry item when the wash water is sprayed to the laundry item; and - a body formed in the shape of a box; - a partition wall for partitioning an internal space of the box-shaped body into a wash water storage unit for storing the wash water and a contaminated water storage unit for storing the contaminated water; and - a fastening unit formed at a lower part of the box-shaped body such that the fastening unit is fastened to the housing for defining a communication space between the wash water storage unit and the contaminated water storage unit, wherein the fastening unit comprises: an air introduction boss for supplying external air to the wash water storage unit, a wash water discharge boss for discharging the wash water stored in the wash water storage unit, a contaminated water introduction boss for introducing the contaminated water into the contaminated water storage unit, and an air collection boss for discharging the air introduced into the contaminated water storage unit together with the contaminated water. an air introduction boss for supplying external air to the wash water storage unit, a wash water discharge boss for discharging the wash water stored in the wash water storage unit, a contaminated water introduction boss for introducing the contaminated water into the contaminated water storage unit, and an air collection boss for discharging the air introduced into the contaminated water storage unit together with the contaminated water.