PURPOSE: An ultraviolet ray-based water treating apparatus is provided to improve the efficiency of water treatment and to rapidly respond to problems based on the simple structure of the apparatus. CONSTITUTION: An ultraviolet ray-based water treating apparatus includes a main body(121), an introducing part(122), a discharging part(123), a plurality of ultraviolet ray irradiating parts(110), a water leakage sensor(200), a valve(150), a controlling part, and an ultrasound wave-based washing unit(170). The main body is divided into three regions(S1 to S3) based on partitions(161, 162). The total volume of the second region and the third region is the same as the volume of the first region. The second region and the third region are arranged at both sides of the first region. Water is introduced into the first region through the introducing part. The water is discharged through the discharging part. The ultraviolet ray irradiating parts are extended to first directions which cross the first region. The water leakage sensor detects whether water through the first region flows through either the second region or the third region. The valve blocks the introducing part. The controlling part drives the valve based on the information of the water leakage sensor. The ultrasound wave-based washing unit is arranged in the first region to eliminate deposits on the outer circumferences of the ultraviolet ray irradiating parts.본 발명은, 제1 방향으로 연장된 자외선 조사부와, 자외선 조사부를 내부에 수용하는 본체부와 본체부 내부로 물이 유입 및 배출하도록 형성된 유입부 및 배출구를 포함하는 하우징, 및 하우징을 통과하는 물의 누수 여부를 감시하는 누수 센서를 포함하는 자외선 수처리 장치에 관한 것이다.
